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Which Mesopotamian city has the best-preserved ziggurat?

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The Great Ziggurat of Ur in Iraq, a massive ancient brick structure with broad staircases and terraced levels, stands alone in a barren landscape. — Mesopotamian art and architecture Ziggurat at Ur (modern Tall al-Muqayyar, Iraq), constructed c. 2100 bce.

The ancient Mesopotamian city with the best-preserved ziggurat is Ur, located in modern-day Iraq.12

While approximately 25 ziggurats have been identified across the regions of Sumer, Babylonia, and Assyria, none remain at their original height. The ziggurat at Ur, which was originally constructed with a core of mud and reed bricks and clad in baked, waterproofed bricks, stands as one of the most significant and well-preserved examples of this architectural form. It was originally dedicated to the Sumerian moon god Nanna and was later designated a UNESCO World Heritage site in 2016.12