The most prominent structure in the ancient city of ur was the stepped temple called the which was built about 4,000 years ago.

It is called the Ziggurat. It is a huge structure worked in antiquated Mesopotamia and the western Iranian level. It has the type of a terraced compound of progressively subsiding stories or levels. 
By 2000 B.C. mud-block ziggurats were being developed in numerous Sumerian urban communities. Afterward, ziggurats were built in Babylonian and Assyrian urban areas. Nobody knows for certain why ziggurats were manufactured or how they were utilized. They are a piece of sanctuary edifices, so they were most likely associated with religion.