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POPSAmazing pre-historic constructions Dolmens are megalithic burial chambers and are found all over Europe but many have been destroyed by modern development. Luckily there are over 200 still in existence in Ireland. Somehow the people of ancient Ireland managed to lift these incredible stones on top of each other to construct these amazing burial places. The top stone weighs 100 tons! This one is in County Carlow in Ireland, is the largest in Europe and pre-dates the pyramids by about 2000 years.