Crannogs always have me wondering if they were built to defend against people...
...or midgies.

Crannog in Loch Ard - Loch Ard visitor guide showing a virtual tour of 'Crannog in Loch Ard' linked to an interactive map with local and travel information. 360° panoramas from Argyll.

This panorama shows the Crannog just south of Eilean Gorm island in Loch Ard. Crannogs are circular loch dwellings that have been used in Scotland for about 5000 years, up till the 17th century. They have acted as homes, farmsteads and refuges. In prehistoric times the crannog was a timber frame structure standing on piles that were driven into the lake bed. During later times a crannog was often formed by piling rocks on the loch bed to form an island on which the hut / house was built. All that remains of most crannogs today are the circular islands covered in trees, or stony mounds just below the surface of the water. There are several hundred crannogs in Scotland as well as some in Ireland and Wales.

Loch Ard is east of Loch Lomond. Water flows into the loch from Loch Chon to the north. It is surrounded by the Queen Elizabeth Forest Park, which also includes Loch Drunkie and Loch Achray. Nearby villages include Kinlochard, Milton, Aberfoyle and Ben Lomond.

Loch Chon is about 30 miles north of Glasgow on the A81 and then B289.