Dumbarton Castle (Scottish Gaelic: Dùn Breatainn pronounced [d̪̊unˈb̊ɾʲɛhd̪̊ɪɲ]) has the longest recorded history of any stronghold in Great Britain. It overlooks the Scottish town of Dumbarton and sits on a plug of volcanic basalt known as Dumbarton Rock which is 240 feet (73 m) high.
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