For thousands of years mankind lived as hunters and gatherers, following the crops and the animals. But something happened that made us go from a simple nomadic lifestyle to create civilizations that through farming and domesticating of animals began to build villages. In this film we will explore the importance of water in the transition from simple villages, to flourished kingdoms, to the construction of the Great Wall of China. We take a closer look at Mesopotamia, Ancient Egypt, Indus Valley and China, and learn how they developed river valley civilizations.