The Poulnabrone Dolmen is a portal tomb which dates back to about 2500 BC. It is one of only four known in Clare, one of only two in the Burren, and the best preserved in all of Ireland.

During excavations conducted by Dr. Lynch in 1986, she discovered the remains of between sixteen and twenty men and women, and one infant, which was said to have been a later addition. Of the adults, all only survived to the age of about 30 except for one who lived to be about 40.