Dun Torcuill,dun,Loch an Duin

The broch lies on a former island about 30 m south-east of a promontory on the west side of Loch an Duin, north-west of Lochmaddy. A causeway 1.9 m wide, curving slightly to the south-east, joins the island to the shore. The broch is built of drystone and occupies the south-eastern part of the island.

The walls lean slightly inwards and stand to a height of about 2.7 m in the north-west and up to 3.0 m in the south. Their thickness varies from 2.25 m in the north and south-west to 3.0 m in the east and 3.75 m in the west and north-west, where fallen rubble covers an entrance that is 1.15 m wide at its inner end. The interior, with a diameter of about 11.4 m, is filled with stone to a height of 1.2 m, which hides all access to the structures within the wall.

In the northern arc a hole in the roof gives access to a section, about 4.5 m long, of a ground-level gallery. The gallery runs roughly in the middle of the wall and is about 0.75 m wide at the bottom and 0.6 m at the top. Its roof forms the floor of an upper gallery, a short section of which survives to a height of about 1.2 m. In the south-eastern segment of the wall there was a stair 0.8 m wide. In the south-western section lay an oval chamber about 5.4 m long, 1.2 m wide and 1.45 m high.

Three irregular annexes adjoin the broch in the north-western part of the island and appear to be later. Their structure suggests that the broch was already abandoned when they were built. They were evidently built of reused stones, have walls 1.35 m thick, and their masonry differs in character from that of the broch. That they were unrelated to the main structure is shown by an outbuilding that begins at the broch entrance and gives access to them.