Poulnabrone Dolmen, County Clare, Ireland.
Poulnabrone Dolmen (Poll na mBrón in Irish meaning "hole of sorrows") is a portal tomb in the Burren, County Clare, Ireland, dating back to the Neolithic period, probably between 4200 BC to 2900 BC.
Original image by pdphoto.org. Uploaded by Jan van der Crabben, published on 26 April 2012 under the following license: Public Domain. This item is in the public domain, and can be used, copied, and modified without any restrictions.