6 Ancient Civilizations: India

Human activity in the Indian sub-continent stretches back over 250,000 years and it is, therefore, one of the oldest inhabited regions on the planet.

The greater Indus region was home to the largest of the four ancient urban civilizations of Egypt, Mesopotamia, South Asia and China. It was not discovered until the 1920's. Most of its ruins, even its major cities, remain to be excavated.