The site, known as An Dún, sits about 350 metres east of the mountain's peak in a position described as exposed, which on the Blasket Islands, battered by the full force of the North Atlantic, is saying something considerable. What drew people to build here, at this altitude and in these conditions, remains an open question.

The structures in question were clochans, a type of dry-stone beehive hut constructed without mortar, corbelled inward until the overlapping stones form a self-supporting dome. They were common in early Christian Ireland, particularly in Kerry, where several survive in better condition on the mainland peninsula nearby. On the Great Blasket, two large circular examples were still clearly visible in the mid-twentieth century, as recorded by Mason in 1950. By the time archaeological attention turned more formally to the site, the picture had become harder to read. What survives today appears to be a spread of collapsed stone in the eastern sector and a roughly circular stony bank to the west, the outlines of the original structures now dissolved into the hillside.