The Info List - Roman Architecture

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Ancient Roman architecture
Ancient Roman architecture
adopted the external language of classical Greek architecture for the purposes of the ancient Romans, but differed from Greek buildings, becoming a new architectural style. The two styles are often considered one body of classical architecture. Roman architecture flourished in the Roman Republic
Roman Republic
and even more so under the Empire, when the great majority of surviving buildings were constructed. It used new materials, particularly concrete, and newer technologies such as the arch and the dome to make buildings that were typically strong and well-engineered. Large numbers remain in some form across the empire, sometimes complete and still in use. Roman Architecture
covers the period from the establishment of the Roman Republic
Roman Republic
in 509 BC to about the 4th century AD, after which it becomes reclassified as Late Antique
Late Antique
or Byzantine architecture. Almost no substantial examples survive from before about 100 BC, and most of the major survivals are from the later empire, after about 100 AD. Roman architectural style continued to influence building in the former empire for many centuries, and the style used in Western Europe beginning about 1000 is called Romanesque architecture
Romanesque architecture
to reflect this dependence on basic Roman forms. The Romans only began to achieve significant originality in architecture around the beginning of the Imperial period, after they had combined aspects of their original Etruscan architecture
Etruscan architecture
with others taken from Greece, including most elements of the style we now call classical architecture. They moved from trabeated construction mostly based on columns and lintels to one based on massive walls, punctuated by arches, and later domes, both of which greatly developed under the Romans. The classical orders now became largely decorative rather than structural, except in colonnades. Stylistic developments included the Tuscan and Composite orders; the first being a shortened, simplified variant on the Doric order
Doric order
and the Composite being a tall order with the floral decoration of the Corinthian and the scrolls of the Ionic. The period from roughly 40 BC to about 230 AD saw most of the greatest achievements, before the Crisis of the Third Century
Crisis of the Third Century
and later troubles reduced the wealth and organizing power of the central government. The Romans produced massive public buildings and works of civil engineering, and were responsible for significant developments in housing and public hygiene, for example their public and private baths and latrines, under-floor heating in the form of the hypocaust, mica glazing (examples in Ostia Antica), and piped hot and cold water (examples in Pompeii
and Ostia).


1 Overview

1.1 Origins 1.2 Roman Architectural Revolution 1.3 Domes

2 Influence on later architecture 3 Materials

3.1 Stone 3.2 Roman brick 3.3 Roman concrete

4 City design 5 Building types

5.1 Amphitheatre 5.2 Basilica 5.3 Circus 5.4 Forum 5.5 Horreum 5.6 Insula 5.7 Lighthouses 5.8 Thermae 5.9 Temples 5.10 Theatres 5.11 Villa 5.12 Watermills

6 Decorative structures

6.1 Monoliths 6.2 Obelisks 6.3 Roman gardens 6.4 Triumphal arch 6.5 Victory columns

7 Infrastructure

7.1 Roads 7.2 Aqueduct 7.3 Bridges 7.4 Canals 7.5 Cisterns 7.6 Dams 7.7 Defensive walls

8 Architectural features

8.1 Mosaics 8.2 Hypocaust 8.3 Roman roofs 8.4 Spiral stairs

9 Significant buildings and areas

9.1 Public buildings 9.2 Private architecture 9.3 Civil engineering 9.4 Military engineering

10 See also 11 References

11.1 Footnotes 11.2 Works cited

12 Further reading 13 External links

Overview[edit] Despite the technical developments of the Romans, which took their buildings far away from the basic Greek conception where columns were needed to support heavy beams and roofs, they were very reluctant to abandon the classical orders in formal public buildings, even though these had become essentially decorative. However, they did not feel entirely restricted by Greek aesthetic concerns, and treated the orders with considerable freedom. Innovation started in the 3rd or 2nd century BC with the development of Roman concrete
Roman concrete
as a readily available adjunct to, or substitute for, stone and brick. More daring buildings soon followed, with great pillars supporting broad arches and domes. The freedom of concrete also inspired the colonnade screen, a row of purely decorative columns in front of a load-bearing wall. In smaller-scale architecture, concrete's strength freed the floor plan from rectangular cells to a more free-flowing environment. Factors such as wealth and high population densities in cities forced the ancient Romans to discover new architectural solutions of their own. The use of vaults and arches, together with a sound knowledge of building materials, enabled them to achieve unprecedented successes in the construction of imposing infrastructure for public use. Examples include the aqueducts of Rome, the Baths of Diocletian
Baths of Diocletian
and the Baths of Caracalla, the basilicas and Colosseum. These were reproduced at a smaller scale in most important towns and cities in the Empire. Some surviving structures are almost complete, such as the town walls of Lugo
in Hispania
Tarraconensis, now northern Spain. The administrative structure and wealth of the empire made possible very large projects even in locations remote from the main centres,[1] as did the use of slave labour, both skilled and unskilled. Especially under the empire, architecture often served a political function, demonstrating the power of the Roman state in general, and of specific individuals responsible for building. Roman architecture perhaps reached its peak in the reign of Hadrian, whose many achievements include rebuilding the Pantheon in its current form and leaving his mark on the landscape of northern Britain with Hadrian's Wall. Origins[edit] While borrowing much from the preceding Etruscan architecture, such as the use of hydraulics and the construction of arches, Roman prestige architecture remained firmly under the spell of Ancient Greek architecture and the classical orders.[2] This came initially from Magna Graecia, the Greek colonies in southern Italy, and indirectly from Greek influence on the Etruscans, but after the Roman conquest of Greece directly from the best classical and Hellenistic
examples in the Greek world. The influence is evident in many ways; for example, in the introduction and use of the Triclinium
in Roman villas as a place and manner of dining. Roman builders employed Greeks in many capacities, especially in the great boom in construction in the early Empire. Roman Architectural Revolution[edit]

The Roman Pantheon was the largest dome in the world for more than a millennium.[3] It is the largest unreinforced solid concrete dome to this day[4]

The Roman Architectural Revolution, also known as the Concrete Revolution,[5][6][7] was the widespread use in Roman architecture of the previously little-used architectural forms of the arch, vault, and dome. For the first time in history, their potential was fully exploited in the construction of a wide range of civil engineering structures, public buildings, and military facilities. These included amphitheatres, aqueducts, baths, bridges, circuses, dams, domes, harbours, temples, and theatres. A crucial factor in this development, which saw a trend toward monumental architecture, was the invention of Roman concrete
Roman concrete
(opus caementicium), which led to the liberation of shapes from the dictates of the traditional materials of stone and brick.[8] These enabled the building of the many aqueducts throughout the empire, such as the Aqueduct of Segovia, the Pont du Gard, and the eleven aqueducts of Rome. The same concepts produced numerous bridges, some of which are still in daily use, for example the Puente Romano at Mérida in Spain, and the Pont Julien
Pont Julien
and the bridge at Vaison-la-Romaine, both in Provence, France. The dome permitted construction of vaulted ceilings without crossbeams and made possible large covered public space such as public baths and basilicas, such as Hadrian's Pantheon, the Baths of Diocletian
Baths of Diocletian
and the Baths of Caracalla, all in Rome. The Romans first adopted the arch from the Etruscans, and implemented it in their own building. The use of arches that spring directly from the tops of columns was a Roman development, seen from the 1st century AD, that was very widely adopted in medieval Western, Byzantine and Islamic architecture. Domes[edit] Main article: History of Roman and Byzantine domes Further information: List of Roman domes

of the Pantheon, inner view

The Romans were the first builders in the history of architecture to realize the potential of domes for the creation of large and well-defined interior spaces.[9] Domes
were introduced in a number of Roman building types such as temples, thermae, palaces, mausolea and later also churches. Half-domes also became a favoured architectural element and were adopted as apses in Christian sacred architecture. Monumental domes began to appear in the 1st century BC in Rome
and the provinces around the Mediterranean Sea. Along with vaults, they gradually replaced the traditional post and lintel construction which makes use of the column and architrave. The construction of domes was greatly facilitated by the invention of concrete, a process which has been termed the Roman Architectural Revolution.[10] Their enormous dimensions remained unsurpassed until the introduction of structural steel frames in the late 19th century (see List of the world's largest domes).[9][11][12] Influence on later architecture[edit]

Stowe House, by William Kent

Roman architecture supplied the basic vocabulary of Pre-Romanesque
and Romanesque architecture, and spread across Christian Europe well beyond the old frontiers of the empire, to Ireland
and Scandinavia
for example. In the East, Byzantine architecture
Byzantine architecture
developed new styles of churches, but most other buildings remained very close to Late Roman forms. The same can be said in turn of Islamic architecture, where Roman forms long continued, especially in private buildings such as houses and the Turkish bath, and civil engineering such as fortifications and bridges. In Europe the Italian Renaissance
Italian Renaissance
saw a conscious revival of correct classical styles, initially purely based on Roman examples. Vitruvius was respectfully reinterpreted by a series of architectural writers, and the Tuscan and Composite orders formalized for the first time, to give five rather than three orders. After the flamboyance of Baroque architecture, the Neoclassical architecture
Neoclassical architecture
of the 18th century revived purer versions of classical style, and for the first time added direct influence from the Greek world. Numerous local classical styles developed, such as Palladian architecture, Georgian architecture
Georgian architecture
and Regency architecture
Regency architecture
in the English-speaking world, Federal architecture
Federal architecture
in the United States, and later Stripped Classicism
Stripped Classicism
and PWA Moderne. Roman influences may be found around us today, in banks, government buildings, great houses, and even small houses, perhaps in the form of a porch with Doric columns and a pediment or in a fireplace or a mosaic shower floor derived from a Roman original, often from Pompeii or Herculaneum. The mighty pillars, domes and arches of Rome
echo in the New World
New World
too, where in Washington DC
Washington DC
we see them in the Capitol Building, the White House, the Lincoln Memorial
Lincoln Memorial
and other government buildings. All across the US the seats of regional government were normally built in the grand traditions of Rome, with vast flights of stone steps sweeping up to towering pillared porticoes, with huge domes gilded or decorated inside with the same or similar themes that were popular in Rome. In Britain, a similar enthusiasm has seen the construction of thousands of neo-Classical buildings over the last five centuries, both civic and domestic, and many of the grandest country houses and mansions are purely Classical in style, an obvious example being Buckingham Palace. Materials[edit]

Frigidarium of Baths of Diocletian, today Santa Maria degli Angeli

Stone[edit] Marble
is not found especially close to Rome, and was only rarely used there before Augustus, who famously boasted that he had found Rome made of brick and left it made of marble, though this was mainly as a facing for brick or concrete. The Temple of Hercules Victor
Temple of Hercules Victor
of the late 2nd century BC is the earliest surviving exception in Rome. From Augustus' reign the quarries at Carrara
were extensively developed for the capital, and other sources around the empire exploited,[13] especially the prestigious Greek marbles like Parian. Travertine limestone was found much closer, around Tivoli, and was used from the end of the Republic; the Colosseum
is mainly built of this stone, which has good load-bearing capacity, with a brick core.[14] Other more or less local stones were used around the empire.[15] The Romans were extremely fond of luxury imported coloured marbles with fancy veining, and the interiors of the most important buildings were very often faced with slabs of these, which have usually now been removed even where the building survives. Imports from Greece for this purpose began in the 2nd century BC.[16] Roman brick[edit] Main article: Roman brick

Close-up view of the wall of the Roman shore fort at Burgh Castle, Norfolk, showing alternating courses of flint and brickwork.

The Romans made fired clay bricks from about the beginning of the Empire, replacing earlier sun-dried mud-brick. Roman brick
Roman brick
was almost invariably of a lesser height than modern brick, but was made in a variety of different shapes and sizes.[17] Shapes included square, rectangular, triangular and round, and the largest bricks found have measured over three feet in length.[18] Ancient Roman bricks had a general size of 1½ Roman feet by 1 Roman foot, but common variations up to 15 inches existed. Other brick sizes in ancient Rome
included 24" x 12" x 4", and 15" x 8" x 10". Ancient Roman bricks found in France
measured 8" x 8" x 3". The Constantine Basilica
in Trier
is constructed from Roman bricks 15" square by 1½" thick.[19] There is often little obvious difference (particularly when only fragments survive) between Roman bricks used for walls on the one hand, and tiles used for roofing or flooring on the other, so archaeologists sometimes prefer to employ the generic term ceramic building material (or CBM). The Romans perfected brick-making during the first century of their empire and used it ubiquitously, in public and private construction alike. The Romans took their brickmaking skills everywhere they went, introducing the craft to the local populations.[19] The Roman legions, which operated their own kilns, introduced bricks to many parts of the empire; bricks are often stamped with the mark of the legion that supervised their production. The use of bricks in southern and western Germany, for example, can be traced back to traditions already described by the Roman architect Vitruvius. In the British Isles, the introduction of Roman brick
Roman brick
by the ancient Romans was followed by a 600–700 year gap in major brick production. Roman concrete[edit]

Example of opus caementicium on a tomb on the ancient Appian Way
Appian Way
in Rome. The original covering has been removed.

Main article: Roman concrete Concrete
quickly supplanted brick as the primary building material,[citation needed] and more daring buildings soon followed, with great pillars supporting broad arches and domes rather than dense lines of columns suspending flat architraves. The freedom of concrete also inspired the colonnade screen, a row of purely decorative columns in front of a load-bearing wall. In smaller-scale architecture, concrete's strength freed the floor plan from rectangular cells to a more free-flowing environment.[citation needed] Most of these developments are described by Vitruvius, writing in the first century AD in his work De Architectura. Although concrete had been used on a minor scale in Mesopotamia, Roman architects perfected Roman concrete
Roman concrete
and used it in buildings where it could stand on its own and support a great deal of weight. The first use of concrete by the Romans was in the town of Cosa
sometime after 273 BC. Ancient Roman concrete
Roman concrete
was a mixture of lime mortar, aggregate, pozzolana, water, and stones, and was stronger than previously-used concretes. The ancient builders placed these ingredients in wooden frames where they hardened and bonded to a facing of stones or (more frequently) bricks. The aggregates used were often much larger than in modern concrete, amounting to rubble. When the framework was removed, the new wall was very strong, with a rough surface of bricks or stones. This surface could be smoothed and faced with an attractive stucco or thin panels of marble or other coloured stones called revetment. Concrete
construction proved to be more flexible and less costly than building solid stone buildings. The materials were readily available and not difficult to transport. The wooden frames could be used more than once, allowing builders to work quickly and efficiently. Concrete
is arguably the Roman contribution most relevant to modern architecture. City design[edit]

The Temple of Claudius
Temple of Claudius
to the south (left) of the Colosseum
(model of Imperial Rome
at the Museo della civiltà romana in Rome)

Further information: Centuriation, Decumanus Maximus, and Cardo The ancient Romans employed regular orthogonal structures on which they molded their colonies.[20][21] [22] They probably were inspired by Greek and Hellenic examples, as well as by regularly planned cities that were built by the Etruscans
in Italy.[23] (see Marzabotto) The Romans used a consolidated scheme for city planning, developed for military defense and civil convenience. The basic plan consisted of a central forum with city services, surrounded by a compact, rectilinear grid of streets, and wrapped in a wall for defense. To reduce travel times, two diagonal streets crossed the square grid, passing through the central square. A river usually flowed through the city, providing water, transport, and sewage disposal.[24] Hundreds of towns and cities were built by the Romans throughout their empire. Many European towns, such as Turin, preserve the remains of these schemes, which show the very logical way the Romans designed their cities. They would lay out the streets at right angles, in the form of a square grid. All roads were equal in width and length, except for two, which were slightly wider than the others. One of these ran east–west, the other, north–south, and they intersected in the middle to form the center of the grid. All roads were made of carefully fitted flag stones and filled in with smaller, hard-packed rocks and pebbles. Bridges were constructed where needed. Each square marked off by four roads was called an insula, the Roman equivalent of a modern city block. Each insula was 80 yards (73 m) square, with the land within it divided. As the city developed, each insula would eventually be filled with buildings of various shapes and sizes and crisscrossed with back roads and alleys. Most insulae were given to the first settlers of a Roman city, but each person had to pay to construct his own house. The city was surrounded by a wall to protect it from invaders and to mark the city limits. Areas outside city limits were left open as farmland. At the end of each main road was a large gateway with watchtowers. A portcullis covered the opening when the city was under siege, and additional watchtowers were constructed along the city walls. An aqueduct was built outside the city walls. The development of Greek and Roman urbanization is relatively well-known, as there are relatively many written sources, and there has been much attention to the subject, since the Romans and Greeks are generally regarded as the main ancestors of modern Western culture. It should not be forgotten, though, that the Etruscans
had many considerable towns and there were also other cultures with more or less urban settlements in Europe, primarily of Celtic origin.[25] Building types[edit] Amphitheatre[edit] Main article: Roman amphitheatre Further information: List of Roman amphitheatres The amphitheatre was, with the triumphal arch and basilica, the only major new type of building developed by the Romans.[26] Some of the most impressive secular buildings are the amphitheatres, over 200 being known and many of which are well preserved, such as that at Arles, as well as its progenitor, the Colosseum
in Rome. They were used for gladiatorial contests, public displays, public meetings and bullfights, the tradition of which still survives in Spain. Their typical shape, functions and name distinguish them from Roman theatres, which are more or less semicircular in shape; from the circuses (akin to hippodromes) whose much longer circuits were designed mainly for horse or chariot racing events; and from the smaller stadia, which were primarily designed for athletics and footraces.[27] The earliest Roman amphitheatres date from the middle of the first century BC, but most were built under Imperial rule, from the Augustan period (27 BC–14 AD) onwards.[28] Imperial amphitheatres were built throughout the Roman empire; the largest could accommodate 40,000–60,000 spectators, and the most elaborate featured multi-storeyed, arcaded façades and were elaborately decorated with marble, stucco and statuary.[29] After the end of gladiatorial games in the 5th century and of animal killings in the 6th, most amphitheatres fell into disrepair, and their materials were mined or recycled. Some were razed, and others converted into fortifications. A few continued as convenient open meeting places; in some of these, churches were sited.[30] Architecturally, they are typically an example of the Roman use of the classical orders to decorate large concrete walls pierced at intervals, where the columns have nothing to support. Aesthetically, however, the formula is successful. Basilica[edit]

Northern aisle of the Basilica
of Maxentius in Rome

The Aula Palatina
Aula Palatina
of Trier, Germany
(then part of the Roman province of Gallia Belgica), built during the reign of Constantine I
Constantine I
(r. 306-337 AD)

The Roman basilica was a large public building where business or legal matters could be transacted. They were normally where the magistrates held court, and used for other official ceremonies, having many of the functions of the modern town hall. The first basilicas had no religious function at all. As early as the time of Augustus, a public basilica for transacting business had been part of any settlement that considered itself a city, used in the same way as the late medieval covered market houses of northern Europe, where the meeting room, for lack of urban space, was set above the arcades, however. Although their form was variable, basilicas often contained interior colonnades that divided the space, giving aisles or arcaded spaces on one or both sides, with an apse at one end (or less often at each end), where the magistrates sat, often on a slightly raised dais. The central aisle tended to be wide and was higher than the flanking aisles, so that light could penetrate through the clerestory windows. The oldest known basilica, the Basilica
Porcia, was built in Rome
in 184 BC by Cato the Elder
Cato the Elder
during the time he was Censor. Other early examples include the basilica at Pompeii
(late 2nd century BC). After Christianity
became the official religion, the basilica shape was found appropriate for the first large public churches, with the attraction of avoiding reminiscences of the Greco- Roman temple
Roman temple
form. Circus[edit] The Roman circus was a large open-air venue used for public events in the ancient Roman Empire. The circuses were similar to the ancient Greek hippodromes, although circuses served varying purposes and differed in design and construction. Along with theatres and amphitheatres, Circuses were one of the main entertainment sites of the time. Circuses were venues for chariot races, horse races, and performances that commemorated important events of the empire were performed there. For events that involved re-enactments of naval battles, the circus was flooded with water. The performance space of the Roman circus was normally, despite its name, an oblong rectangle of two linear sections of race track, separated by a median strip running along the length of about two thirds the track, joined at one end with a semicircular section and at the other end with an undivided section of track closed (in most cases) by a distinctive starting gate known as the carceres, thereby creating a circuit for the races. Forum[edit] Further information: Roman Forum
Roman Forum
and List of monuments of the Roman Forum

The Roman Forum

A forum was a central public open space in a Roman municipium, or any civitas, primarily used as a marketplace, along with the buildings used for shops and the stoas used for open stalls. Other large public buildings were often sited at the edges or close by. Many forums were constructed at remote locations along a road by the magistrate responsible for the road, in which case the forum was the only settlement at the site and had its own name, such as Forum Popili or Forum Livi.[31] During the years of the Republic, Augustus
claimed he "found the city in brick and left it in marble".[32] While chances are high that this was an exaggeration, there is something to be said for the influx of marble use in Roman Forum
Roman Forum
from 63 BC onwards. During Augustus
reign, the Forum was described to have been "a larger, freer space than was the Forum of imperial times."[33] The Forum began to take on even more changes upon the arrival of Julius Casear who drew out extensive plans for the market hub. While Casear's death came prematurely, the ideas himself, as well as Augustus
had in regards to the Forum proved to be the most influential for years to come. According to Walter Dennison's The Roman Forum
Roman Forum
As Cicero
Saw It, the author writes that "the diverting of public business to the larger and splendid imperial fora erected in the vicinity resulted in leaving the general design of the Forum Romanum".[33] Every city had at least one forum of varying size. In addition to its standard function as a marketplace, a forum was a gathering place of great social significance, and often the scene of diverse activities, including political discussions and debates, rendezvous, meetings, etc. Much the best known example is the Roman Forum, the earliest of several in Rome. In new Roman towns the forum was usually located at, or just off, the intersection of the main north-south and east-west streets (the cardo and decumanus). All forums would have a Temple of Jupiter at the north end, and would also contain other temples, as well as the basilica; a public weights and measures table, so customers at the market could ensure they were not being sold short measures; and would often have the baths nearby.

A panoramic view of the Forum Trajanum, with the Trajan's Column
on the far left.


The Horrea Epagathiana et Epaphroditiana, a horreum in Ostia built c. 145-150 AD

A horreum was a type of public warehouse used during the ancient Roman period. Although the Latin
term is often used to refer to granaries, Roman horrea were used to store many other types of consumables; the giant Horrea Galbae
Horrea Galbae
in Rome
were used not only to store grain but also olive oil, wine, foodstuffs, clothing and even marble.[34] By the end of the imperial period, the city of Rome
had nearly 300 horrea to supply its demands.[35] The biggest were enormous, even by modern standards; the Horrea Galbae
Horrea Galbae
contained 140 rooms on the ground floor alone, covering an area of some 225,000 square feet (21,000 m²).[36] The first horrea were built in Rome
towards the end of the 2nd century BC,[37] with the first known public horreum being constructed by the ill-fated tribune, Gaius Gracchus
Gaius Gracchus
in 123 BC.[38] The word came to be applied to any place designated for the preservation of goods; thus it was often used refer to cellars (horrea subterranea), but it could also be applied to a place where artworks were stored,[39] or even to a library.[40] Some public horrea functioned somewhat like banks, where valuables could be stored, but the most important class of horrea were those where foodstuffs such as grain and olive oil were stored and distributed by the state.[41] The word itself is thought to have linguist roots tied to the word hordeum which in Latin
means 'barley'.[42] In the John's Hopkin's University Press, The Classical Weekly states that "Pliny the Elder does indeed make a distinction between the two words6. He describes the horreum as a structure made of brick, the walls of which were not less than three feet thick; it had no windows or openings for ventilation".[43] Furthermore, the storehouses would also host oil and wine and also utilize large jars that could serve as cache's for large amounts of products.These storehouses were also used to house keep large sums of money and were used much like personal storage units today are. Romans were "These horrea were divided and subdivided, so that one could hire only so much space as one wanted, a whole room (cella), a closet (armarium), or only a chest or strong box (arca, arcula, locus, loculus)."[43] Insula[edit] Main article: Insula (building)

Insula in Ostia Antica

Multi-story apartment blocks called insulae catered to a range of residential needs. The cheapest rooms were at the top owing to the inability to escape in the event of a fire and the lack of piped water. Windows were mostly small, facing the street, with iron security bars. Insulae
were often dangerous, unhealthy, and prone to fires because of overcrowding and haphazard cooking arrangements.[citation needed] There are examples in the Roman port town of Ostia, that date back to the reign of Trajan, but they seem to have been found only in Rome
and a few other places. Elsewhere writers report them as something remarkable, but Livy
and Vituvius refer to them in Rome.[44] External walls were in "Opus Reticulatum" and interiors in "Opus Incertum", which would then be plastered and sometimes painted. To lighten up the small dark rooms, tenants able to afford a degree of painted colourful murals on the walls. Examples have been found of jungle scenes with wild animals and exotic plants. Imitation windows (trompe l'oeil) were sometimes painted to make the rooms seem less confined. Ancient Rome
had elaborate and luxurious houses owned by the elite. The average house, or in cities apartment, of a commoner or plebe did not contain many luxuries. The domus, or single-family residence, was only for the well-off in Rome, with most having a layout of the closed unit, consisting of one or two rooms. Between 312 and 315 A.D. Rome had 1781 domus and 44,850 of insulae.[45] Insulae
have been the subject of great debate for historians of Roman culture, defining the various meanings of the word.[46] Insula was a word used to describe apartment buildings, or the apartments themselves,[47] meaning apartment, or inhabitable room, demonstrating just how small apartments for Plebes were. Urban divisions were originally street blocks, and later began to divide into smaller divisions, the word insula referring to both blocks and smaller divisions. The insula contained cenacula, tabernae, storage rooms under the stairs, and lower floor shops. Another type of housing unit for Plebes was a cenaculum, an apartment, divided into three individual rooms: cubiculum, exedra, and medianum. Common Roman apartments were mainly masses of smaller and larger structures, many with narrow balconies that present mysteries as to their use, having no doors to access them, and they lacked the excessive decoration and display of wealth that aristocrats’ houses contained. Luxury in houses was not common, as the life of the average person did not consist of being in their houses, as they instead would go to public baths, and engage in other communal activities. Lighthouses[edit] Main article: Roman lighthouse

The Tower of Hercules, a Roman lighthouse
Roman lighthouse
in Spain

Many lighthouses were built around the Mediterranean and the coasts of the empire, including the Tower of Hercules
Tower of Hercules
at A Coruña
A Coruña
in northern Spain, a structure which survives to this day. A smaller lighthouse at Dover, England also exists as a ruin about half the height of the original. The light would have been provided by a fire at the top of the structure. Thermae[edit] Main article: Thermae Further information: List of Roman public baths All Roman cities had at least one thermae, a popular facility for public bathing, exercising and socializing. Exercise might include wrestling and weight-lifting, as well as swimming. Bathing was an important part of the Roman day, where some hours might be spent, at a very low cost subsidized by the government. Wealthier Romans were often accompanied by one or more slaves, who performed any required tasks such as fetching refreshment, guarding valuables, providing towels, and at the end of the session, applying olive oil to their masters' bodies which was then scraped off with a strigil, a scraper made of wood or bone. Romans did not wash with soap and water as we do now. Roman bath-houses were also provided for private villas, town houses and forts. They were normally supplied with water from an adjacent river or stream, or by aqueduct. The design of thermae is discussed by Vitruvius
in De Architectura. Temples[edit] Main article: Roman temple

"Roman Baroque" Temple of Bacchus
Temple of Bacchus
at Baalbek, Lebanon

Roman temples were among the most important and richest buildings in Roman culture, though only a few survive in any sort of complete state. Their construction and maintenance was a major part of ancient Roman religion, and all towns of any importance had at least one main temple, as well as smaller shrines. The main room (cella) housed the cult image of the deity to whom the temple was dedicated, and often a small altar for incense or libations. Behind the cella was a room or rooms used by temple attendants for storage of equipment and offerings. Some remains of many Roman temples survive, above all in Rome
itself, but the relatively few near-complete examples were nearly all converted to Christian churches (and sometimes subsequently to mosques), usually a considerable time after the initial triumph of Christianity
under Constantine. The decline of Roman religion was relatively slow, and the temples themselves were not appropriated by the government until a decree of the Emperor Honorius in 415. Some of the oldest surviving temples include the Temple of Hercules Victor (mid 2nd century BC) and Temple of Portunus
Temple of Portunus
(120-80 BC), both standing within the Forum Boarium. The form of the Roman temple
Roman temple
was mainly derived from the Etruscan model, but using Greek styles. Roman temples emphasised the front of the building, which followed Greek temple
Greek temple
models and typically consisted of wide steps leading to a portico with columns, a pronaos, and usually a triangular pediment above, which was filled with statuary in the most grand examples; this was as often in terracotta as stone, and no examples have survived except as fragments. However, unlike the Greek models, which generally gave equal treatment to all sides of the temple, which could be viewed and approached from all directions, the sides and rear of Roman temples might be largely undecorated (as in the Pantheon, Rome
Pantheon, Rome
and Vic), inaccessible by steps (as in the Maison Carrée
Maison Carrée
and Vic), and even back on to other buildings. As in the Maison Carrée, columns at the side might be half-columns, emerging from ("engaged with" in architectural terminology) the wall.[48] The platform on which the temple sat was typically raised higher in Roman examples than Greek, with up ten or twelve or more steps rather than the three typical in Greek temples; the Temple of Claudius
Temple of Claudius
was raised twenty steps. These steps were normally only at the front, and typically not the whole width of that. The Greek classical orders in all their details were closely followed in the façades of temples, as in other prestigious buildings. However the idealized proportions between the different elements set out by the only significant Roman writer on architecture to survive, Vitruvius, and subsequent Italian Renaissance
Italian Renaissance
writers, do not reflect actual Roman practice, which could be very variable, though always aiming at balance and harmony. Following a Hellenistic
trend, the Corinthian order
Corinthian order
and its variant the Composite order
Composite order
were most common in surviving Roman temples, but for small temples like that at Alcántara, a simple Tuscan order
Tuscan order
could be used.[49] There was considerable local variation in style, as Roman architects often tried to incorporate elements the population expected in its sacred architecture. This was especially the case in Egypt
and the Near East, where different traditions of large stone temples were already millennia old. The Romano-Celtic temple
Romano-Celtic temple
was a simple style for small temples found in the Western Empire, and by far the most common type in Roman Britain. It often lacked any of the distinctive classical features, and may have had considerable continuity with pre-Roman temples of the Celtic religion. Theatres[edit]

Roman Theatre (Mérida), Spain

Roman theatres were built in all areas of the empire from Spain, to the Middle East. Because of the Romans' ability to influence local architecture, we see numerous theatres around the world with uniquely Roman attributes.[50] These buildings were semi-circular and possessed certain inherent architectural structures, with minor differences depending on the region in which they were constructed. The scaenae frons was a high back wall of the stage floor, supported by columns. The proscaenium was a wall that supported the front edge of the stage with ornately decorated niches off to the sides. The Hellenistic
influence is seen through the use of the proscaenium. The Roman theatre also had a podium, which sometimes supported the columns of the scaenae frons. The scaenae was originally not part of the building itself, constructed only to provide sufficient background for the actors. Eventually, it became a part of the edifice itself, made out of concrete. The theatre itself was divided into the stage (orchestra) and the seating section (auditorium). Vomitoria or entrances and exits were made available to the audience.[51] Villa[edit]

Villa of the Mysteries
Villa of the Mysteries
just outside Pompeii, seen from above

Main article: Roman villa See also: Villa rustica, List of Roman villas in England, and List of Roman villas in Belgium A Roman villa
Roman villa
was a country house built for the upper class, while a domus was a wealthy family's house in a town. The Empire contained many kinds of villas, not all of them lavishly appointed with mosaic floors and frescoes. In the provinces, any country house with some decorative features in the Roman style may be called a "villa" by modern scholars.[52] Some were pleasure palaces such as those— like Hadrian's Villa
Hadrian's Villa
at Tivoli— that were situated in the cool hills within easy reach of Rome
or— like the Villa of the Papyri
Villa of the Papyri
at Herculaneum— on picturesque sites overlooking the Bay of Naples. Some villas were more like the country houses of England or Poland, the visible seat of power of a local magnate, such as the famous palace rediscovered at Fishbourne in Sussex. Suburban villas on the edge of cities were also known, such as the Middle and Late Republican villas that encroached on the Campus Martius, at that time on the edge of Rome, and which can be also seen outside the city walls of Pompeii, including the Villa of the Mysteries, famous for its frescos. These early suburban villas, such as the one at Rome's Auditorium
site[53] or at Grottarossa in Rome, demonstrate the antiquity and heritage of the villa suburbana in Central Italy. It is possible that these early, suburban villas were also in fact the seats of power (maybe even palaces) of regional strongmen or heads of important families (gentes). A third type of villa provided the organizational center of the large farming estates called latifundia; such villas might be lacking in luxuries. By the 4th century, villa could simply mean an agricultural estate or holding: Jerome
translated the Gospel of Mark
Gospel of Mark
(xiv, 32) chorion, describing the olive grove of Gethsemane, with villa, without an inference that there were any dwellings there at all (Catholic Encyclopedia "Gethsemane"). With the colossal Diocletian's Palace, built in the countryside but later turned into a fortified city, a form of residential castle emerges, that anticipates the Middle Ages. Watermills[edit] Further information: List of ancient watermills The initial invention of the watermill appears to have occurred in the hellenized eastern Mediterranean in the wake of the conquests of Alexander the Great and the rise of Hellenistic
science and technology.[54][55][56] In the subsequent Roman era, the use of water-power was diversified and different types of watermills were introduced. These include all three variants of the vertical water wheel as well as the horizontal water wheel.[57][58] Apart from its main use in grinding flour, water-power was also applied to pounding grain,[59][60][61] crushing ore,[62] sawing stones[63] and possibly fulling and bellows for iron furnaces.[64] Decorative structures[edit] Monoliths[edit] Further information: List of ancient Greek and Roman monoliths In architecture, a monolith is a structure which has been excavated as a unit from a surrounding matrix or outcropping of rock.[65] Monoliths are found in all types of Roman buildings. They were either: quarried without being moved; or quarried and moved; or quarried, moved and lifted clear off the ground into their position (e.g. architraves); or quarried, moved and erected in an upright position (e.g. columns). Transporting was done by land or water (or a combination of both), in the later case often by special-built ships such as obelisk carriers.[66] For lifting operations, ancient cranes were employed since ca. 515 BC,[67] such as in the construction of Trajan's Column.[68] Obelisks[edit] Further information: List of obelisks in Rome

Obelisco Sallustiano in front of the church of Trinità dei Monti
Trinità dei Monti
in Rome

An obelisk is a tall, four-sided, narrow tapering monument which ends in a pyramid-like shape at the top. These were originally called "tekhenu" by the builders, the ancient Egyptians. The Greeks who saw them used the Greek 'obeliskos' to describe them, and this word passed into Latin
and then English.[69] The Romans commissioned obelisks in an ancient Egyptian style. Examples include:

Arles, France
– the Arles
Obelisk, in Place de la République, a 4th-century obelisk of Roman origin Benevento, Italy – three Roman obelisks[70][71] Munich – obelisk of Titus
Sextius Africanus, Staatliches Museum Ägyptischer Kunst, Kunstareal, 1st century AD, 5.80 m Rome
– there are five ancient Roman obelisks in Rome.

Roman gardens[edit]

Gardens in Conimbriga, Portugal

Roman gardens
Roman gardens
were influenced by Egyptian, Persian, and Greek gardening techniques. In Ancient Latium, a garden was part of every farm. According to Cato the Elder, every garden should be close to the house and should have flower beds and ornamental trees.[72] Horace wrote that during his time flower gardens became a national indulgence.[73] Gardens were not reserved for the extremely wealthy. Excavations in Pompeii
show that gardens attaching to residences were scaled down to meet the space constraints of the home of the average Roman. Modified versions of Roman garden designs were adopted in Roman settlements in Africa, Gaul, and Britannia. As town houses were replaced by tall insula (apartment buildings), these urban gardens were replaced by window boxes or roof gardens.[citation needed] Triumphal arch[edit] Further information: List of Roman triumphal arches

The Arch
of Titus
in Rome, an early Roman imperial triumphal arch with a single archway

Titus' triumphal procession depicted on the Arch
of Titus, showing the loot captured from Jerusalem
in 81 AD

A triumphal arch is a monumental structure in the shape of an archway with one or more arched passageways, often designed to span a road. The origins of the Roman triumphal arch are unclear. There were precursors to the triumphal arch within the Roman world; in Italy, the Etruscans
used elaborately decorated single bay arches as gates or portals to their cities. Surviving examples of Etruscan arches can still be seen at Perugia
and Volterra.[74] The two key elements of the triumphal arch – a round-topped arch and a square entablature – had long been in use as separate architectural elements in ancient Greece. The innovation of the Romans was to use these elements in a single free-standing structure. The columns became purely decorative elements on the outer face of arch, while the entablature, liberated from its role as a building support, became the frame for the civic and religious messages that the arch builders wished to convey.[75] Little is known about how the Romans viewed triumphal arches. Pliny the Elder, writing in the first century AD, was the only ancient author to discuss them.[76] He wrote that they were intended to "elevate above the ordinary world" an image of an honoured person usually depicted in the form of a statue with a quadriga.[76] The first recorded Roman triumphal arches were set up in the time of the Roman Republic.[77] Generals who were granted a triumph were termed triumphators and would erect fornices or honorific arches bearing statues to commemorate their victories.[78] Roman triumphal practices changed significantly at the start of the imperial period when the first Roman Emperor
Roman Emperor
decreed that only emperors would be granted triumphs. The triumphal arch changed from being a personal monument to being an essentially propagandistic one, serving to announce and promote the presence of the ruler and the laws of the state.[74] Arches were not necessarily built as entrances, but – unlike many modern triumphal arches – they were often erected across roads and were intended to be passed through, not round.[79] Most Roman triumphal arches were built during the imperial period. By the fourth century AD there were 36 such arches in Rome, of which three have survived – the Arch
of Titus
(AD 81), the Arch
of Septimius Severus (203-205) and the Arch
of Constantine (312). Numerous arches were built elsewhere in the Roman Empire.[77] The single arch was the most common, but many triple arches were also built, of which the Triumphal Arch
of Orange (circa AD 21) is the earliest surviving example. From the 2nd century AD, many examples of the arcus quadrifrons – a square triumphal arch erected over a crossroads, with arched openings on all four sides – were built, especially in North Africa. Arch-building in Rome
and Italy diminished after the time of Trajan
(AD 98-117) but remained widespread in the provinces during the 2nd and 3rd centuries AD; they were often erected to commemorate imperial visits.[78] The ornamentation of an arch was intended to serve as a constant visual reminder of the triumph and triumphator. The façade was ornamented with marble columns, and the piers and attics with decorative cornices. Sculpted panels depicted victories and achievements, the deeds of the triumphator, the captured weapons of the enemy or the triumphal procession itself. The spandrels usually depicted flying Victories, while the attic was often inscribed with a dedicatory inscription naming and praising the triumphator. The piers and internal passageways were also decorated with reliefs and free-standing sculptures. The vault was ornamented with coffers. Some triumphal arches were surmounted by a statue or a currus triumphalis, a group of statues depicting the emperor or general in a quadriga.[74][78] Inscriptions on Roman triumphal arches were works of art in themselves, with very finely cut, sometimes gilded letters. The form of each letter and the spacing between them was carefully designed for maximum clarity and simplicity, without any decorative flourishes, emphasizing the Roman taste for restraint and order. This conception of what later became the art of typography remains of fundamental importance down to the present day.[79] Victory columns[edit] Further information: List of Roman victory columns Infrastructure[edit]

A Roman street in Pompeii

Roads[edit] Roman roads
Roman roads
were vital to the maintenance and development of the Roman state, and were built from about 500 BC through the expansion and consolidation of the Roman Republic
Roman Republic
and the Roman Empire.[80] They provided efficient means for the overland movement of armies, officials and civilians, and the inland carriage of official communications and trade goods.[81] At the peak of Rome's development, no fewer than 29 great military highways radiated from the capital, and the Late Empire's 113 provinces were interconnected by 372 great road links.[82][83] Roman road
Roman road
builders aimed at a regulation width (see Laws and standards above), but actual widths have been measured at between 3.6 ft (1.1 m) and more than 23 ft (7.0 m). Today, the concrete has worn from the spaces around the stones, giving the impression of a very bumpy road, but the original practice was to produce a surface that was no doubt much closer to being flat. Aqueduct[edit] Main article: Roman aqueduct Further information: List of aqueducts in the Roman Empire

The Aqueduct of Segovia, Spain

The Pont du Gard, near Vers-Pont-du-Gard, France

The Romans constructed numerous aqueducts in order to bring water from distant sources into their cities and towns, supplying public baths, latrines, fountains and private households. Waste water was removed by complex sewage systems and released into nearby bodies of water, keeping the towns clean and free from effluent. Aqueducts also provided water for mining operations, milling, farms and gardens. Aqueducts moved water through gravity alone, being constructed along a slight downward gradient within conduits of stone, brick or concrete. Most were buried beneath the ground, and followed its contours; obstructing peaks were circumvented or, less often, tunnelled through. Where valleys or lowlands intervened, the conduit was carried on bridgework, or its contents fed into high-pressure lead, ceramic or stone pipes and siphoned across. Most aqueduct systems included sedimentation tanks, sluices and distribution tanks to regulate the supply at need. Rome's first aqueduct supplied a water-fountain sited at the city's cattle market. By the third century AD, the city had eleven aqueducts, sustaining a population of over a million in a water-extravagant economy; most of the water supplied the city's many public baths. Cities and municipalities throughout the Roman Empire
Roman Empire
emulated this model, and funded aqueducts as objects of public interest and civic pride, "an expensive yet necessary luxury to which all could, and did, aspire."[84] Most Roman aqueducts
Roman aqueducts
proved reliable, and durable; some were maintained into the early modern era, and a few are still partly in use. Methods of aqueduct surveying and construction are noted by Vitruvius
in his work De Architectura
De Architectura
(1st century BC). The general Frontinus
gives more detail in his official report on the problems, uses and abuses of Imperial Rome's public water supply. Notable examples of aqueduct architecture include the supporting piers of the Aqueduct of Segovia, and the aqueduct-fed cisterns of Constantinople. Bridges[edit]

The Alcántara Bridge, Spain, a masterpiece of ancient bridge building

Main article: Roman bridge Further information: List of Roman bridges Roman bridges, built by ancient Romans, were the first large and lasting bridges built.[85] Roman bridges were built with stone and had the arch as the basic structure (see arch bridge). Most utilized concrete as well, which the Romans were the first to use for bridges. Roman arch bridges were usually semicircular, although a few were segmental (such as Alconétar Bridge). A segmental arch is an arch that is less than a semicircle.[86] The advantages of the segmental arch bridge were that it allowed great amounts of flood water to pass under it, which would prevent the bridge from being swept away during floods and the bridge itself could be more lightweight. Generally, Roman bridges featured wedge-shaped primary arch stones (voussoirs) of the same in size and shape. The Romans built both single spans and lengthy multiple arch aqueducts, such as the Pont du Gard
Pont du Gard
and Segovia Aqueduct. Their bridges featured from an early time onwards flood openings in the piers, e.g. in the Pons Fabricius
Pons Fabricius
in Rome
(62 BC), one of the world's oldest major bridges still standing. Roman engineers were the first and until the industrial revolution the only ones to construct bridges with concrete, which they called Opus caementicium. The outside was usually covered with brick or ashlar, as in the Alcántara bridge. The Romans also introduced segmental arch bridges into bridge construction. The 330 m long Limyra Bridge
Limyra Bridge
in southwestern Turkey features 26 segmental arches with an average span-to-rise ratio of 5.3:1,[87] giving the bridge an unusually flat profile unsurpassed for more than a millennium. Trajan's bridge
Trajan's bridge
over the Danube
featured open-spandrel segmental arches made of wood (standing on 40 m high concrete piers). This was to be the longest arch bridge for a thousand years both in terms of overall and individual span length, while the longest extant Roman bridge
Roman bridge
is the 790 m long Puente Romano at Mérida. Canals[edit] Further information: List of Roman canals Roman canals were typically multi-purpose structures, intended for irrigation, drainage, land reclamation, flood control and navigation where feasible. Some navigational canals were recorded by ancient geographers and are still traceable by modern archaeology. Channels which served the needs of urban water supply are covered at the List of aqueducts in the Roman Empire. Cisterns[edit] Further information: List of Roman cisterns

The Basilica
Cistern in Constantinople
provided water for the Imperial Palace.

Freshwater reservoirs were commonly set up at the termini of aqueducts and their branch lines, supplying urban households, agricultural estates, imperial palaces, thermae or naval bases of the Roman navy.[88] Dams[edit] Further information: List of Roman dams and reservoirs Roman dam construction began in earnest in the early imperial period.[89] For the most part, it concentrated on the semi-arid fringe of the empire, namely the provinces of North Africa, the Near East, and Hispania.[90] [91][92] The relative abundance of Spanish dams below is due partly to more intensive field work there; for Italy only the Subiaco Dams, created by emperor Nero
(54–68 AD) for recreational purposes, are attested.[93][89] These dams are noteworthy, though, for their extraordinary height, which remained unsurpassed anywhere in the world until the Late Middle Ages.[89] The most frequent dam types were earth- or rock-filled embankment dams and masonry gravity dams.[94] These served a wide array of purposes, such as irrigation, flood control, river diversion, soil-retention, or a combination of these functions.[95] The impermeability of Roman dams was increased by the introduction of waterproof hydraulic mortar and especially opus caementicium in the Concrete
Revolution. These materials also allowed for bigger structures to be built,[96] like the Lake Homs Dam, possibly the largest water barrier today,[97] and the sturdy Harbaqa Dam, both of which consist of a concrete core. Roman builders were the first to realize the stabilizing effect of arches and buttresses, which they integrated into their dam designs. Previously unknown dam types introduced by the Romans include arch-gravity dams,[92][98] arch dams,;[99][100][101] [102][103] buttress dams,[104] and multiple-arch buttress dams.[105][106][98][107] Defensive walls[edit]

Roman walls of Lugo, Spain

The Porta Nigra
Porta Nigra
of Trier, Germany, capital of the Roman province
Roman province
of Gallia Belgica, constructed between 186 and 200 AD

Main article: Ancient Roman defensive walls The Romans generally fortified cities, rather than fortresses, but there are some fortified camps, such as the Saxon Shore
Saxon Shore
forts like Porchester Castle
in England. City walls were already significant in Etruscan architecture, and in the struggle for control of Italy under the early Republic many more were built, using different techniques. These included tightly-fitting massive irregular polygonal blocks, shaped to fit exactly in a way reminiscent of later Inca
work. The Romans called a simple rampart wall an agger; at this date great height was not necessary. The Servian Wall
Servian Wall
around Rome
was an ambitious project of the early 4th century BC. The wall was up to 10 metres (32.8 ft) in height in places, 3.6 metres (12 ft) wide at its base, 11 km (7 mi) long,[108] and is believed to have had 16 main gates, though many of these are mentioned only from writings, with no other known remains. Some of it had a fossa or ditch in front, and an agger behind, and it was enough to deter Hannibal. Later the Aurelian Wall
Aurelian Wall
replaced it, enclosing an expanded city, and using more sophisticated designs, with small forts at intervals. The Romans walled major cities and towns in areas they saw as vulnerable, and parts of many walls remain incorporated in later defences, as at Córdoba (2nd century BC), Chester (earth and wood in the 70s AD, stone from c. 100), and York (from 70s AD). Strategic walls across open country were far rarer, and Hadrian's Wall
Hadrian's Wall
(from 122) and the Antonine Wall
Antonine Wall
(from 142, abandoned only 8 years after completion) are the most significant examples, both on the Pictish frontier. Architectural features[edit] Mosaics[edit] Main article: Roman mosaic On his return from campaigns in Greece, the general Sulla brought back what is probably the most well-known element of the early imperial period, the mosaic, a decoration made of colourful chips of stone inserted into cement. This tiling method took the empire by storm in the late first century and the second century and in the Roman home joined the well known mural in decorating floors, walls, and grottoes with geometric and pictorial designs. There were two main techniques in Greco-Roman mosaic: opus vermiculatum used tiny tesserae, typically cubes of 4 millimeters or less, and was produced in workshops in relatively small panels which were transported to the site glued to some temporary support. The tiny tesserae allowed very fine detail, and an approach to the illusionism of painting. Often small panels called emblemata were inserted into walls or as the highlights of larger floor-mosaics in coarser work. The normal technique, however, was opus tessellatum, using larger tesserae, which were laid on site.[109] There was a distinct native Italian style using black on a white background, which was no doubt cheaper than fully coloured work.[110] A specific genre of Roman mosaic
Roman mosaic
obtained the name asaroton (Greek "unswept floor"). It represented an optical illusion of the leftovers from a feast on the floor of reach houses.[111] Hypocaust[edit]

Part-excavated hypocaust under the floor in a Roman villa
Roman villa
in Vieux-la-Romaine, near Caen, France

A hypocaust was an ancient Roman system of underfloor heating, used to heat houses with hot air. The Roman architect Vitruvius, writing about the end of the 1st century B.C., attributes their invention to Sergius Orata. Many remains of Roman hypocausts have survived throughout Europe, western Asia, and northern Africa. The hypocaust was an invention which improved the hygiene and living conditions of citizens, and was a forerunner of modern central heating. Hypocausts were used for heating hot baths (thermae), houses and other buildings, whether public or private. The floor was raised above the ground by pillars, called pilae stacks, with a layer of tiles, then a layer of concrete, then another of tiles on top; and spaces were left inside the walls so that hot air and smoke from the furnace would pass through these enclosed areas and out of flues in the roof, thereby heating but not polluting the interior of the room. Roman roofs[edit] Further information: List of ancient Greek and Roman roofs In Sicily truss roofs presumably appeared as early as 550 BC.[112]Their potential was fully realized in the Roman period, which saw trussed roofs over 30 wide spanning the rectangular spaces of monumental public buildings such as temples, basilicas, and later churches. Such spans were three times as wide as the widest prop-and-lintel roofs and only surpassed by the largest Roman domes.[113] The largest truss roof by span of ancient Rome
covered the Aula Regia (throne room) built for emperor Domitian
(81–96 AD) on the Palatine Hill, Rome. The timber truss roof had a width of 31.67 m, slightly surpassing the postulated limit of 30 m for Roman roof constructions. Tie-beam trusses allowed for much larger spans than the older prop-and-lintel system and even concrete vaulting. Nine out of the ten largest rectangular spaces in Roman architecture were bridged this way, the only exception being the groin vaulted Basilica
of Maxentius.[113] Spiral stairs[edit] Further information: List of ancient spiral stairs The spiral stair is a type of stairway which, due to its complex helical structure, was introduced relatively late into architecture. Although the oldest example dates back to the 5th century BC,[114] it was only in the wake of the influential design of Trajan's Column
that this space-saving new type permanently caught hold in Roman architecture.[115] Apart from the triumphal columns in the imperial cities of Rome
and Constantinople, other types of buildings such as temples, thermae, basilicas and tombs were also fitted with spiral stairways.[115] Their notable absence in the towers of the Aurelian Wall
Aurelian Wall
indicates that although used in medieval castles, they did not yet figure prominently in Roman military engineering.[115] By late antiquity, separate stair towers were constructed adjacent to the main buildings, as in the Basilica
of San Vitale. The construction of spiral stairs passed on both to Christian and Islamic architecture. Significant buildings and areas[edit]

Hadrian's Wall

Public buildings[edit]

Baths of Trajan
– these were a massive thermae, a bathing and leisure complex, built in ancient Rome
starting from 104 AD and dedicated during the Kalends of July in 109. Baths of Diocletian
Baths of Diocletian
– in ancient Rome, these were the grandest of the public baths (thermae), built by successive emperors Baths of Caracalla Colosseum Trajan's Column, in Rome Circus Maximus, in Rome Curia Hostilia
Curia Hostilia
(Senate House), in Rome Domus
Aurea (former building) Pantheon Tower of Hercules Tropaeum Traiani Hadrian's Villa Verona Arena, in Verona

Private architecture[edit]

– a necropolis in Arles, France, one of the most famous necropolises of the ancient world Domus Catacombs of Rome Roman villa Pompeii
and Herculaneum

Civil engineering[edit]

Roman engineering
Roman engineering
– Romans are famous for their advanced engineering accomplishments, although some of their own inventions were improvements on older ideas, concepts and inventions. Roman watermill

Military engineering[edit]

Antonine Wall, in Scotland Hadrian's Wall Limes Germanicus

See also[edit]

Outline of ancient Rome Outline of architecture Architecture
of Mesopotamia Persian architecture

Ancient Rome
portal Italy portal History portal Architecture

References[edit] Footnotes[edit]

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were, in their turn, probably also influenced in this respect by Greek and Hellenic culture." ^ Vitrivius 1914. ^ Demandt 1998: "In fact, many sites where the Romans created towns, such as Paris, Vienna and Bratislava, had previously been Celtic settlements of more or less urban character." ^ Henig, 26. Blagg also mentions baths, granaries, insulae and large villas. ^ Bomgardner 2000, p. 37. ^ Bomgardner 2000, p. 59. ^ Bomgardner 2000, p. 62. ^ Bomgardner 2000, p. 201–223. ^ Abbott & Johnson 1926, p. 12. ^ https://www.jstor.org/stable/43943460 ^ a b Dennison, Walter (June 1908). "The Roman Forum
Roman Forum
as Cicero
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at Encyclopædia Britannica ^ a b c F. B. Sear and Richard John. "Triumphal arch." Grove Art Online. Oxford Art Online. 30 Jul. 2010 ^ a b Honour & Fleming 2005. ^ Forbes 1993, p. 146. ^ Kaszynski 2000, p. 9. ^ Bunson 2009, p. 195. ^ O'Flaherty 2002, p. 2. ^ Gagarin & Fantham 2010, p. 145. ^ O'Connor 1993, p. 1. ^ Beall, Christine (1988). "Designing the segmental arch" (PDF). ebuild.com. Retrieved 8 May 2010. [permanent dead link] ^ O'Connor 1993, p. 126. ^ Döring 2002, pp. 310–319. ^ a b c Hodge 1992, p. 87. ^ Schnitter 1978, p. 28, fig. 7. ^ Hodge 1992, p. 80. ^ a b Hodge 2000, p. 332. ^ Smith 1970, pp. 60f.. ^ Hodge 2000, pp. 331f.. ^ Hodge 1992, pp. 86f.. ^ Smith 1971, p. 49. ^ Smith 1971, p. 42. ^ a b James & Chanson 2002. ^ Smith 1971, pp. 33–35. ^ Schnitter 1978, pp. 31f.. ^ Schnitter 1987a, p. 12. ^ Schnitter 1987c, p. 80. ^ Hodge 2000, p. 332, fn. 2. ^ Schnitter 1987b, pp. 59–62. ^ Schnitter 1978, p. 29. ^ Schnitter 1987b, pp. 60, table 1, 62. ^ Arenillas & Castillo 2003. ^ Fields, Nic; Peter Dennis The Walls of Rome
Osprey Publishing; 10 Mar 2008 ISBN 978-1-84603-198-4 p.10 [1] ^ Smith 1983, pp. 116–119. ^ Smith 1983, pp. 121–123. ^ Miller 1972. ^ Hodge 1960, p. 38–44. ^ a b Ulrich 2007, pp. 148f. ^ Beckmann 2002. ^ a b c Beckmann 2002, p. 353–356.

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Library resources about Ancient Roman architecture

Online books Resources in your library Resources in other libraries

Further reading[edit]

Adam, Jean Pierre. Roman Building: Materials and Techniques. Bloomington: Indiana University Press, 1994. Anderson, James C. Roman Architecture
and Society. Baltimore: Johns Hopkins University Press, 1997. Boëthius, Axel. Etruscan and Early Roman Architecture. New Haven: Yale University Press, 1994. Fant, J. Clayton. "Quarrying and Stoneworking." In The Oxford Handbook of Engineering
and Technology in the Classical World, edited by John P. Oleson, 121–135. Oxford: Oxford University Press, 2008. Hopkins, John North. The Genesis of Roman Architecture. New Haven: Yale University Press, 2016. Lancaster, Lynne C. Concrete
Vaulted Construction In Imperial Rome: Innovations In Context. Cambridge: Cambridge University Press, 2005. --. "Roman Engineering
and Construction." In The Oxford Handbook of Engineering
and Technology in the Classical World, edited by John P. Oleson, 256–284. Oxford: Oxford University Press. 2008. MacDonald, William Lloyd. The Architecture
of the Roman Empire. Rev. ed. New Haven: Yale University Press, 1982. Macready, Sarah, and F. H. Thompson. Roman architecture in the Greek world. London: Society of Antiquaries, 1987. Sear, Frank. Roman Architecture. Ithaca: Cornell University Press, 1983. Thomas, Edmund V. Monumentality and the Roman Empire: Architecture
in the Antonine age. Oxford: Oxford University Press, 2007. Ulrich, Roger B. Roman Woodworking. New Haven: Yale University Press, 2007. Ulrich, Roger B., and Caroline K Quenemoen. A Companion to Roman Architecture. Somerset: Wiley, 2013.

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