More 'Islands of Stone'

Today we had to go to Benbecula to pick up a presecription for a friend. 
Not having spent much time walking in the hinterland there, today was our chance. I combined it with getting some imagery for the Islands of Stone project.
This site simply looks like an untidy pile of sotnes from the shore but put the drone over it and the detail is revealed. Experience shows this is almost certainly a set of medieval buildings - almost a mini-castle set in a huge moat!