From "Ziggurat of King Urnammu, Ur." Mud Bricks. 2100 B.C.
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The construction of ziggurats in Mesopotamia probably originated from an earlier
tradition of raising temples on terraces so that they would be higher than any of the
surrounding buildings. Many of the surviving ziggurats show signs of having been built
over early examples. This ziggurat at Ur was erected in its present form by the King
Ur-nammu around 2100 B.C., who dedicated it to the moon-god Nanna. It consists of
three terraced stages and rose some 70 feet above the rest of the city. Mesopotamian
ziggurats may have inspired the biblical story of the tower of Babel.