Maeshowe or Maes Howe mās´hou [key], prehistoric monument, on Mainland in the Orkney Islands, off N Scotland, near Stenness (see Stenness, Loch of ). A passage grave with a corbeled vault, it measures 115 ft (35 m) in diameter and 23 ft (7 m) high. It dates to the early 3d millennium BC A runic inscription on the wall records a 12th-century Viking visit.
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