'The still-intact, grand structure of the Jaigarh Fort is connected to the Amber Fort by underground tunnels, but this isn’t the only exciting thing about this popular Jaipur tourist destination. The fort has the world’s largest cannon on wheels, a museum with age-old artifacts and weapons, a palace, and an assembly hall. You get a spectacular view of the entire city from atop the fort making the arduous climb all the more worthwhile. The Jaigarh fort was originally built to protect the Amber Fort and the palace inside it from neighboring kings and warlords. '