The ancient civilization known for its ziggurats is the Sumerians, who thrived in Mesopotamia around 3000 BCE. Ziggurats were massive, tiered structures that served as temples and administrative centers. These impressive buildings, made of mud bricks, were often dedicated to various gods and reflected the Sumerians' religious beliefs and architectural skill. The most famous ziggurat is the Great Ziggurat of Ur, which showcases the intricate design and social organization of the Sumerians, marking their significant contributions to urban civilization and culture.