There are two Iron-Age vitrified forts on Eilean nan Gobhar or Goat Island, the larger on the summit. With little view of a fleet approaching from the north it is likely that the forts were used as sentinels in a chain of telegraphic communication using smoke or fire.
Uploaded to Geograph by Jo Turner on 20 June 2010
Photo © Jo Turner, 20 June 2010. Licensed for reuse under this Creative Commons licence