Orkney is full of prehistoric sites. There are neolithic settlements and stone circles, burial cairns and strange unexplained chambers. We visited the Ring of Brodgar on a suitably misty day. It's wonderful to walk from the smaller Ring of Stenness towards Ring of Brodgar, which first appears on the hilltop in the distance then to finally reach the circle.
We also visited Skara Brae, a wonderfully preserved neolithic settlement, which was built partly sunk into the ground (interesting to think that current ideas on building environmentally friendly buildings sunk into the ground are presented as so radical) or possibly became gradually buried by sand-dunes (which may be an explanation for the apparent sudden abandonment of the settlement).