The ancient Mesopotamian structure known for its tiered design is the ziggurat. Ziggurats were massive, terraced structures built as religious temples dedicated to various gods within the Sumerian, Akkadian, Babylonian, and Assyrian cultures. They often consisted of a square or rectangular base with several levels that ascended to a shrine at the top. Ziggurats served both as places of worship and as administrative centers. One of the most famous is the Ziggurat of Ur, highlighting the architectural ingenuity of ancient Mesopotamian civilizations. Their unique design reflects the religious significance and social structure of the time.