Built of mud-brick, the Ziggurat at Ur was built by Ur-Nammu c. 2050 BC during the Third Dynasty of Ur and dedicated to the moon-goddess Nanna.
The massive structure is 210 feet in length, 150 feet in width. It was massively restored under King Nabonidus in the 6th century BC.
Photo taken by Tla2006
For perspective, this would approximately fill up the entire field space between the bleachers in an American Football Stadium. I always pictured it bigger than that?