Poulnabrone Dolmen – located in County Clare on the Burren plateau east of the Ballyvaughan – Corrofin road.
It is the oldest monumental megalithic monument in Ireland – its ceiling is made of a flat granite slab measuring 3.5 by 2 meters and weighing nearly 40 tons, supported by two carrying boulders at the height of 1.8 meters it’s entrance has been directed towards the north.
In 1985, renovation and archaeological works were held there during which the remains of 15 adults and 6 children were discovered, as well as various tools that were subjected to radiocarbon dating, which allowed to determine the age at around 3800 and 3200 years BC. it was also established that the tomb was permanently used for around 600 years.
In the Bronze Age, the tomb was re-used for the burial of a newborn.
The whole area around is a characteristic karst landscape resulting from a combination of dissolution under the influence of rainwater and glacial activity (16 thousand years ago), when large glacier lumps dislocated and formed characteristic cracks in limestone blocks called ridges.