#megalith__megalithic_structure  memorial consisting of a very large stone forming part of a prehistoric structure (especially in W Europe)
  supertype:  #memorial.structure__monument  a structure erected to commemorate persons or events
  subtype:  #dolmen__cromlech  a prehistoric megalith typically having two upright stones and a capstone
  subtype:  #menhir  a tall upright megalith; found primarily in N France and England

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