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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