The ancient city's ruins found in modern-day Iraq, known for the famous ziggurat, is Babylon. Babylon was one of the most significant cities in ancient Mesopotamia and is renowned for its impressive architectural achievements, including the Ziggurat of Babel, which is often associated with the biblical story of the Tower of Babel. The city reached its peak during the reign of King Nebuchadnezzar II in the 6th century BCE and was a center for trade, culture, and intellectual advancement. The ruins of Babylon, including the ziggurat, were designated a UNESCO World Heritage Site, reflecting its historical and cultural importance.