The Jaigarh fort is the most spectacular of the three-hilltop forts that overlook Jaipur. In Mughal times, the Jaipur region was a major weapon-producing centre for the Mughal and Rajput rulers, several of the weapons being on display in the fort's museum. It is one of the few military structures of medieval India preserved almost intact, containing palaces, a granary, a well-planned cannon foundry, several temples, a tall tower and giant mounted cannon-the Jai Ban (Jaivan) which is the largest cannon on wheels in the world.