It's circular, about 4 metres in diametre, and a few moments' investigation showed that it consisted....
The roof is obviously long gone, and it may look small and rude, but this was almost certainly a dwelling house.
We spent some time searching the surrounding area, and found four more structures, of which three were similar to the first.
Bing's aerial view - which is particularly good as it was taken in winter with the sun low - we were amazed at the amount of agricultural activity.
We knew that the land on which the structures stood was part of the old Glendrian clachan's lands, so we checked Bald's map of 1806, which shows all the worked land of West Ardnamurchan's various clachans.
Aerial views from Bing Maps.
Bald's map of Glendrian courtesy Donald Houston at Ardnamurchan Estate.