I'm afraid I'm with the Scots on this one; often are, similar landscapes. About 10 miles down the road from me, literally in someone's front garden, there's a huge dolmen; Irish neolithical grave. Oisin's grave in Cushendall is another; I walked up to it last year, against the wishes of the farmer, but it was John Hewitt's (the poet of the glen's) chosen ground, where he had his memorial place, and I really wanted to see it; stone circle on the side of the hill overlooking Glenann; the fairy glen, very lovely (I'll see if I can scan one of the photos of me there and put it up tomorrow).
I've been to several of the famous ones in England, and miss the sense of them not being celebrated, just being part of the landscape, accidental. (I'm sure there's many that are, but the famous ones tend to take the attention from them.) There is a sense of wonderment, whereever they are, a sense of someone went to a lot of trouble to put them there.
Not sure where they tie into crop circles, though; we don't get any of them here, the farmer's wouldn't take kindly to it, I suspect, and we have mostly small farms, not the big industrial type, and an awful lot of hill farming/ coastal land/ bogland, so probably not ideal locations.