The Harappan civilization flourished from 3300 BCE to 1300 BCE along the Indus River valley. Some key aspects include:
1) Major urban centers included Harappa and Mohenjo-Daro, which had planned streets and separate areas for citizens and aristocrats.
2) Notable structures include the Great Bath at Mohenjo-Daro, believed to be used for religious rituals, and granaries to store grains.
3) The civilization engaged in extensive trade using standardized weights and measures, with connections to Mesopotamia evidenced by seals.