Post by Uncle Henry on Nov 30, 2017 4:29:46 GMT -5
Picture Postcard twenty-six
On the reverse:
Department of the Environment. 1. Onston Cairn.
This is a Neolithic chambered cairn located about two miles north-east of Stromness on Orkney. Wikipædia names it "Unstan", and suggests that the date of its construction was some time between 3400 and 2800 B.C.