The civilizations known for their ziggurats are primarily the Mesopotamian cultures, especially the Sumerians, Akkadians, Babylonians, and Assyrians. Ziggurats were massive, terraced structures that served as temples or religious platforms, typically built in the center of city-states. Their unique design, made of mud bricks, featured a rectangular base with several levels that rose to a shrine at the top. The most famous ziggurat is the Ziggurat of Ur, associated with the Sumerian moon god Nanna. These monumental structures reflect the religious beliefs and architectural ingenuity of ancient Mesopotamian civilizations, underscoring their cultural significance.