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A dolmen (also known as cromlech (Welsh), anta, Hünengrab, Hunebed, Goindol, quoit, and portal dolmen) is a type of single-chamber megalithic tomb, usually consisting of three or more upright stones supporting a large flat horizontal capstone (table). Most date from the early Neolithic period (4000 to 3000 BC). Dolmens were usually covered with earth or smaller stones to form a barrow, though in many cases that covering has weathered away, leaving only the stone "skeleton" of the burial mound intact.
http://en.wikipedia.org/wiki/Dolmen
