In the 1920s, the discovery of ancient cities at Mohenjo Daro and Harappa in Pakistan gave the first clue to the existence more than 4,000 years ago of a civilization in the Indus Valley to rival those known in Egypt and Mesopotamia. These cities demonstrated an exceptional level of civic planning and amenities.
The houses were furnished with brick-built bathrooms and many had toilets. Wastewater from these was led into well-built brick sewers that ran along the center of the streets, covered with bricks or stone slabs. Cisterns and wells finely constructed of wedge-shaped bricks held public supplies of drinking water. Mohenjo Daro also boasted a Great Bath on the high mound (citadel) overlooking the residential area of the city. Built of layers of carefully fitted bricks, gypsum mortar and waterproof bitumen, this basin is generally thought to have been used for ritual purification.
Mohenjo-daro, Indus Valley Civilization in Pakistan. (suronin /Adobe Stock)