The Babylonian Empire began as a city-state. Then the Babylonian king, King Hammurabi, decided to conquer other city-states and formed the Babylonian Empire.
During King Hammurabi's reign, the city-state of Babylon became the most powerful in the world. Because Babylon was built on the bank of the Euphrates River, the people of Babylon were able to sail to distant lands and trade goods and ideas.
Babylon was located right in the center of the Babylonian Empire. This city-state was famous for its architectural prowess, or skill in architecture.
In the middle of Babylon was a gigantic, three-hundred-foot-tall temple called a ziggurat.
A ziggurat looked like a flat-topped pyramid with flights of stairs running up each of the sides.