Doon Castle

The broch stands on the south side of Ardwell Point, which projects out into the North Channel. An early description mentions that it is separated from the mainland by a wall and a natural gully, 6 meters across and 2.3 meters deep, crossed by a man-made causeway 1.9 meters wide and 0.9 meters high.

The structure is 9 meters in diameter with walls 3-4 meters thick. On the northeast side the wall is preserved to a height of 1.8 meters. The broch had two entrances, one on the north-northeast side, which is blocked by fallen stones, and a second on the south side. These two entrances coincide with land and sea approaches. There is a chamber to the east, with a possible second chamber to the west. The remains of the eastern chamber consist of the sides of the entrance, measuring 0.8 meters at the mouth and 1.2 meters closer to the inner wall face. Far less is known about the possible west chamber.

Between the broch and the northern end of the point there are further remains, including a wall approximately 2.6 meters thick. This wall appears to enclose an area 14 meters (E-W) by 10 meters (N-S). The outer structure was likely entered through the north-northeast wall, opposite the man-made causeway.

The broch was first recorded by archaeologists in 1912 by RCAHMS in the Fourth Report and Inventory of Monuments and Constructions in Galloway. It has since been mentioned in several other publications but has yet to be excavated. Survey has revealed only rubble in the interior.