The document summarizes key structures of the Indus civilization, including the citadel, great bath, granary, and streets. The citadel was a fortified structure used as a shelter. It was made of durable mud bricks. The great bath was a large ritual bathing structure near the citadel, also made of mud bricks. The granary was a massive brick building possibly used for grain storage and religious rituals by rulers. The streets had organized drainage systems to dispose of water and sewage.