The Callanish Standing Stones, 15 miles west of Stornoway on the A858 road, form one of the most complete stone circles in Britain. It is one of the most atmospheric prehistoric sites anywhere. Sited on a wild and secluded promontory overlooking Loch Roag, 13 large stones of beautifully banded gneiss are arranged, as if in worship, around a 4.5m-tall central monolith. Some 40 smaller stones radiate from the circle in the shape of a cross, with the remains of a chambered tomb at the centre. Dating from 3800 to 5000 years ago, the stones are roughly contemporary with the pyramids of Egypt.