“Poulnabrone dolmen in western Ireland
Cribbed from Wikipedia:
The name means “hole of the quern stones” and it’s a portal tomb – one of approximately 174 in Ireland – based in the Burren, County Clare, Ireland, dating back to the Neolithic period, probably between 4200 BC and 2900 BC. It is situated 8 km (5 miles) south of Ballyvaughan, 9.6 km (6 miles) north-west of Kilnaboy[2]“