Indian history starts from Indus valley Civilization. It was discovered in 1921. It belongs to proto-historic period. The first discovered Indus site was Harappa . This civilization flourished during the period of 3250-2750 B.C This period is only approximate. Many historians proposed different dates. The important sites of this civilization are: Harappa, Mohanjodaro, Lothal, Kalibhangan, Chanhudaro, rupar, Sutkagendor, Banwali, Alamgirpur, Rangapur, Surkotada, Kotdiji, dholavira, balakot etc. the main feature of Harappa civilization was Town Planning. The main male diety was Pasupati. The main female Goddess was Mother Goddess. The Great Bath was found in Mohanjodaro. The evidence of ploughing the land was found in Kalibangan. The metal Iron was not known to Indus people. A dockyard structure was found in Lothal. The evidence of ship was found in Mohanjodaro. The main occupation of Indus people was cattle breeding. They also know the agriculture. The main crops they produced were: Wheat and Barly. Indus people produced cotton for the first time in the world. Mohanjodaro is largest of all Indus sites. Dholavira in Gujarat is the largest Indus site in India