Assyrian architecture
Architecture of the Assyrian empire (centered between the Tigris and the Upper and Lower Zab rivers in southwest Asia) was expressive of its might, as conquerors of Mesopotamia and much of the adjacent countries between the 9th and 7th century B.C. Mud brick was used as the building material, although stone was available; stone was used only for carved revetments and monumental decorative sculptures. Vaulting played a much greater role than in southern Mesopotamia. Excavations have uncovered large palaces and temple complexes with their ziggurats in Assyrian cities such as Assur, Calah (Nimrud), Nineveh, and Dur Sharrukin (Korsabad), as well as extensive fortifications. (Harris, 1977)