stone circle 
noun
A megalithic monument of a type found mainly in western Europe, consisting of stones, typically standing stones, arranged more or less in a circle.Surviving monuments in the Kilmartin Valley include a ‘linear cemetery’ of Bronze Age cairns, several standing stones, a stone circle and numerous elaborate rock art panels....
- To the south are a stone circle, a cairn, two standing stones, and a large burial cist.
- A square setting of posts around the prehistoric stone circle may represent some form of religious structure, and a number of isolated postholes have been interpreted as settings for totem-poles.
The earliest stone circles date from the Neolithic period. In the early Bronze Age many hundreds of small circles were constructed in western Britain, often from quite small stones. Circles often appear to be aligned astronomically, especially with particular sunrise or sunset positions, and it is generally agreed that they had a ritual function.