In archaeology, a wheelhouse is a prehistoric structure from the Iron Age found in Scotland. Sometimes referred to as "aisled roundhouses" their characteristic features include an outer wall within which a circle of stone piers (bearing a resemblance to the spokes of a wheel) form the basis for lintel arches supporting corbelled roofing with a hearth at the hub. Some are double-walled. They range in diameter from 4 metres to 11.5 metres. The earliest part of the Jarlshof wheelhouse complex has been dated to 200 BC.