A ziggurat (ˈzɪɡʊˌræt; Cuneiform: 𒅆𒂍𒉪, Akkadian: ziqqurratum, D-stem of zaqārum 'to protrude, to build high', cognate with other Semitic languages like Hebrew zaqar (זָקַר) 'protrude') is a type of massive structure built in ancient Mesopotamia. It has the form of a terraced compound of successively receding storeys 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 Plus, Sumer in general. The Sumerians believed that the gods lived in the temple at the top of the ziggurats, so only priests and other highly respected individuals could enter. Sumerian society offered them many things such as music, harvest, and creating devotional statues to live in the temple. The word ziggurat comes from ziqqurratum (height, pinnacle), in ancient Assyrian. From zaqārum, to be high up. The Ziggurat of Ur is a Neo-Sumerian ziggurat built by King Ur-Nammu, who dedicated it in honor of Nanna/Sîn in approximately the 21st century BC during the Third Dynasty of Ur. Ziggurats were built by ancient Sumerians, Akkadians, Elamites, Eblaites and Babylonians for local religions. Each ziggurat was part of a temple complex that included other buildings. The precursors of the ziggurat were raised platforms that date from the Ubaid period during the sixth millennium BC. The ziggurats began as platforms (usually oval, rectangular or square). The ziggurat was a mastaba-like structure with a flat top. The 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. According to archaeologist Harriet Crawford, It is usually assumed that the ziggurats supported a shrine, though the only evidence for this comes from Herodotus, and physical evidence is non-existent .