Lighthouses On The Canadian Register Of Historic Places
A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lens (optics), lenses and to serve as a beacon for navigational aid, for maritime pilots at sea or on inland waterways. Lighthouses mark dangerous coastlines, hazardous shoals, reefs, rocks, and safe entries to harbors; they also assist in aerial navigation. Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and has become uneconomical since the advent of much cheaper, more sophisticated and effective electronic navigational systems. History Ancient lighthouses Before the development of clearly defined ports, mariners were guided by fires built on hilltops. Since elevating the fire would improve the visibility, placing the fire on a platform became a practice that led to the development of the lighthouse. In antiquity, the lighthouse functioned more as an entrance marker to ports than as a warning signa ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Aveiro March 2012-13
Aveiro may refer to: * Aveiro, Pará, a municipality in Brazil * Aveiro, Portugal, a city and municipality in Portugal ** Região de Aveiro, surrounding the city above ** Aveiro District, surrounding the municipality above ** Roman Catholic Diocese of Aveiro, surrounding the city above ** Aveiro Lagoon (Ria de Aveiro), near the city above *** Aveiro Light, at the entrance to the lagoon above People

* Dukes of Aveiro, an aristocratic Portuguese title, granted in 1535 * Cristiano Ronaldo dos Santos Aveiro (born 1985), Portuguese footballer * Kátia Aveiro (born 1977), Portuguese singer * José Aveiro (born 1936), Paraguayan footballer {{disambiguation, geo, surname Portuguese-language surnames ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]