Period 2 · c. 3500-539 BCE

Mesopotamia

Between the Tigris and the Euphrates, in what is now Iraq, people built the first cities, wrote the first texts and raised temple towers of mud brick. Their kings carved lion hunts and laws in stone and lined Babylon's gates with blue glazed bricks. Start here to see how much of city life began in one river valley.

The reconstructed blue-glazed Ishtar Gate inside the Pergamon Museum in Berlin.
Photo: Radomir Vrbovsky, CC BY-SA 4.0, via Wikimedia Commons