The Great Bath was the most impressive building structure found in the citadel of Mohenjodaro. It is rectangular in shape just like a swimming pool. It was made of baked bricks. A layer of tar and bitumen was used to make it water tight. There are two flights of steps on either side of the Great Bath. Changing rooms are also present on all sides of the Bath. The water for bathing was probably drawn from wells that was drained out through a proper drainage system. It was used only on special occasions.