The Indus Valley was home to the largest of the four ancient urban civilizations of China, Egypt, Mesopotamia, and India. Undiscovered until the 1920’s most of its ruins still have not been excavated.

Evidence for the Indus Valley civilisation dates from circa 6000 BC and continues until as late as 1000 BC as the civilisation gradually dissipated as a result of dramatic changes in the local river systems.

The archeaological evidence suggests that underfloor heating may have been invented by this great culture and passed to the Romans through trade and the interchange of peoples.