A bit slow on the uptake here (it being over a week since this was posted) but that's gotta be one of the most perfect looking circles! I really wish I'd payed it a visit when I was in Cork last year. I was advised to, by a certain stone circle expert, but didn't heed his advice, being short on time, and instead decided to take up the same experts advice to see Ballyvackey (another great Cork site, mind). Bugger... :)

http://www.themodernantiquarian.com/image.php?image_id=13298