A timeline from 3,000 to 2,000 BCE — the age of pyramids, the first empires, and the flourishing of river valley civilizations.
Sumerian city-states enter a period of intense competition and cultural flowering. The Royal Tombs of Ur date to this era.
Architect Imhotep builds the first large-scale stone structure in history — the Step Pyramid at Saqqara, launching the age of pyramid construction.
Harappa, Mohenjo-daro, and dozens of other planned cities appear across the Indus Valley — the world's largest Bronze Age civilization by area.
Pharaoh Khufu's Great Pyramid is built — the tallest structure on Earth for the next 3,800 years, a testament to Egyptian engineering and royal power.
Mohenjo-daro reaches its height with 40,000 inhabitants, the Great Bath, grid streets, and the most sophisticated urban drainage system in the ancient world.
Sargon rises from obscurity to conquer all of Mesopotamia and beyond, creating the world's first empire and a new model of political organization.
The Akkadian Empire collapses under pressure from internal rebellions and a severe drought — one of history's earliest examples of climate-driven political collapse.
The Sumerian Renaissance under Ur-Nammu produces the world's oldest surviving law code and a brief period of Sumerian cultural revival.
The oldest known legal code is written in Sumerian, predating Hammurabi's Code by three centuries. It prescribes fines rather than physical punishment for many offenses.