The document discusses the ancient Babylonian civilization and the city of Babylon. It describes how Babylon was the capital city located along the Euphrates River in Mesopotamia. Under King Hammurabi in the 18th century BC, Babylon became the dominant city-state in the region and established itself as a powerful empire. Key aspects of ancient Babylon discussed include the city walls, temples, ziggurats, and other impressive architectural feats such as the Hanging Gardens, built later under King Nebuchadnezzar II.