Poulnabrone Dolmen, Ireland
Poulnabrone Dolmen (meaning “hole of the quern stones”) is a portal tomb in the Burren, County Clare, Ireland, dating back to the Neolithic period, probably between 4200 and 2900 BC.
The dolmen consists of a twelve-foot, thin, slab-like, tabular capstone supported by two slender portal stones, which support the capstone 1.8 m (6 ft) from the ground, creating a chamber in a 9 m (30 ft) low cairn. The cairn helped stabilize the tomb chamber, and would have been no higher during the Neolithic. The entrance faces north and is crossed by a low sill stone.