Standing Stones, Isle of Lewis
Calanais III a megalithic structure consisting of a outer ring of 8 standing stones with 5 fallen stones and an inner ring of 4 stones. It is one of a number of ritual sites in the area including the main Calanais stones. Erected approximately 5000 years ago, no one knows for sure what their purpose was.
Near Mangersta there are a series of sea stacks that are similarly structured. An outside ring of sea stacks with a single individual in the middle. Could this be another ritual site, except created by the strength of the ocean?