dolmen -
A prehistoricmegalithic tomb consisting of a capstone supported by two or more upright stones, most having originally been covered with earth or smaller stones to form a barrow.
Wikipedia
A dolmen—also known as a portal tomb, portal grave, cromlech, anta, Hünengrab/Hünenbett, Hunebed, dyss, goindol or quoit—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 BCE). 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.
OmegaWiki Dictionary
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dolmen A prehistoric megalithic tomb typically having two large upright stones and a capstone.
