also, Summerhouse Hill, which is really perplexing because the boulders do seem to be in a circle but there is just something which screams "glacial". When I first visited, I thought they were the remains of a circle but over the past couple of years and numerous visits, I have revised my theory. However, someone obvioulsy thought the stones were important and symbolic enough to build a cairn, slap bang in the middle of them!

http://www.themodernantiquarian.com/site/3016