Mesopotamian architecture(3000–500 B.C.)
Architecture developed by the Euphrates and Tigris Valley civilizations, from the 3rd millennium to the 6th cent. B.C. Primarily a massive architecture of mud bricks set in clay mortar or bitumen. The heavy walls were articulated by pilasters and recesses; important public buildings were faced with baked or glazed brick. Rooms were narrow and long and generally covered by timber and mud roofs, but in certain cases also by tunnel vaults; columns were seldom used; openings usually were small.