Poulnabrone Dolmen

Poulnabrone dolmen is a large dolmen located in the Burren, County Clare, Ireland. Situated on one of the region's most desolate and highest points, it comprises three standing portal stones supporting a heavy horizontal capstone and dates to the early Neolithic period, with estimates from 3800 and 3200 BC. Although not the largest, it is the best known of the approximately 172 dolmens in Ireland. (Wikipedia)