The stone circle near Keswick in Cumbria, called Castlerigg, is thought to be one of the earliest, dating to 3000 B.C. There are 38 stones in a 100 foot circle, and another 10 stones in a small rectangle. There are some local signs calling it Druid's circle, but the Druids came 2000 years later, so the name must have been added much after the fact.
Humans have lived near this circle for 5000 years, so I bet that some of the beliefs about it must still be intact.
Look at the three apples left as offering at one of the bases of the stones. . . .
Again, I get the sense not that the stones are here because people wanted them to mark some reoccurring human behavior, but that they are there because they mark something about the Earth herself. We in our species-centric modern way of thinking have a hard time understanding maybe it is not about the humans at all.
Anyway - it was wonderful to visit and try to connect to the mystery of this place.
"The Eternal looked upon me for a moment with His eye of power, and annihilated me in His being, and become manifest to me in His essence. I saw I existed through Him." --Rumi