These photos were taken at the Broch of Gurness in Evie, in the West Mainland of Orkney. It was a clear starry night and there was faint aurora borealis visible to the North behind Rousay.
The photos are long exposures capturing light created by people with torches.
The Broch of Gurness is an Iron Age village dating from before 200BC. The main feature would have been a circular tower, which is ringed by ditches and other buildings. It has been in ruins for centuries, and has probably not been occupied since the 5th Century AD.