It seems you can’t walk anywhere in the West Country without tripping over a stone circle. I came across this one by the A39, when I was walking out of Glastonbury, in the direction of Street.
In the region of Oxfordshire there are great stones disposed as if by the hand of man. But at what time, or by what people, or for what memorial or significance this was done is not known. However that place is called Rollendrich by the local people. (Historia Brittonum, 9th century)