In archaeology, a wheelhouse is a prehistoric structure from the Iron Age found in Scotland. The term was first coined after the discovery of a ruined mound in 1855. The distinctive architectural form related to the complex roundhouses, constitute the main settlement type in the Western Isles, in the closing centuries BC. A total of 62 sites have now been identified in the Northern and Western Isles, and on the north coast of Caithness and Sutherland.