The term 'Parts of Ziggurats' refers to the structure of a ziggurat, which is an ancient Mesopotamian temple tower. The most common part of a ziggurat is its TIERS, which are large, stepped platforms that form the structure of the tower. The TIERS were made of mud brick and were often decorated with glazed tiles. The TIERS were usually arranged in a pyramid shape, with each tier being smaller than the one below it.