Dunagoil is a

vitrified fort Vitrified forts are stone enclosures whose walls have been subjected to vitrification through heat. It was long thought that these structures were unique to Scotland, but they have since been identified in several other parts of western and northe ...

dun A dun is an ancient or medieval fort. In Ireland and Britain it is mainly a kind of hillfort and also a kind of Atlantic roundhouse. Etymology The term comes from Irish ''dún'' or Scottish Gaelic ''dùn'' (meaning "fort"), and is cognat ...

on the

Isle of Bute The Isle of Bute ( sco, Buit; gd, Eilean Bhòid or '), known as Bute (), is an island in the Firth of Clyde in Scotland, United Kingdom. It is divided into highland and lowland areas by the Highland Boundary Fault. Formerly a constituent is ...

– an

Iron Age The Iron Age is the final epoch of the three-age division of the prehistory and protohistory of humanity. It was preceded by the Stone Age ( Paleolithic, Mesolithic, Neolithic) and the Bronze Age ( Chalcolithic). The concept has been mostl ...

hill fort A hillfort is a type of earthwork used as a fortified refuge or defended settlement, located to exploit a rise in elevation for defensive advantage. They are typically European and of the Bronze Age or Iron Age. Some were used in the post-Roma ...

whose ramparts have been melted by intense heat. It stands on a volcanic headland and gives its name to the bay that it overlooks. Like other places, such as Donegal, its name is from the Gaelic ''dún na gall'' – fort of the foreigners.

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* * Hill forts in Scotland Scheduled Ancient Monuments in Argyll and Bute Isle of Bute {{Scotland-struct-stub