Ziqqurat

A ziggurat (/ˈzɪɡəræt/ ZIG-ər-at; Akkadian ziqqurat, D-stem of zaqāru "to build on a raised area") is a massive structure built in ancient Mesopotamia and the western Iranian plateau. It has the form of a terraced compound of successively receding stories or levels. Notable ziggurats include the Great Ziggurat of Ur near Nasiriyah, the Ziggurat of Aqar Quf near Baghdad, the now destroyed Etemenanki in Babylon, Chogha Zanbil in Khūzestān and Sialk.

Ziggurats were built by the ancient Sumerians, Akkadians, Assyrians, Elamites, Eblaites and Babylonians for local religions, predominantly Mesopotamian religion and Elamite religion. Each ziggurat was part of a temple complex which included other buildings. The precursors of the ziggurat were raised platforms that date from the Ubaid period during the sixth millennium. The earliest ziggurats began as a platform (usually oval, rectangular or square), the ziggurat was a mastaba-like structure with a flat top. Sun-baked bricks made up the core of the ziggurat with facings of fired bricks on the outside. Each step was slightly smaller than the step below it. The facings were often glazed in different colors and may have had astrological significance. Kings sometimes had their names engraved on these glazed bricks. The number of floors ranged from two to seven.

...
Wikipedia