The citadel of the Harappan cities had some important buildings. One of these is called the Great Bath present at the Mohenjodaro. It was lined with bricks, coated with plaster, natural tar was used to make it water-tight. The steps were present on two sides. The rooms were present on all sides. A well would supply water to it and water was probably drained after usage. It was probably used by important people for taking dips on some important occasions.