This dramatic site, on the karstic limestone pavement of the Burren, is one of the most famous Irish dolmens. The name Poulnabrone literally means 'The hole of the sorrows'. The thin capstone sits on two 1.8m (6ft) high portal stones to create a chamber in a 9m (30ft) low cairn. The eastern portal stone was replaced in 1985, following a discovery that it was unfortunately cracked; excavations during the repair showed that this site dated back to about 2500 BC.