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Megalith, huge, often undressed stone used in various types of Neolithic (New Stone Age) and Early Bronze Age monuments. Although some aspects of the spread and development of megalithic monuments are still under debate, in Spain, Portugal, and the Mediterranean coast the most ancient of the cyclopean stone tombs was probably the dolmen. The dolmen consisted of several upright supports and a flat roofing slab, all covered by a protective mound of earth that in...