Jaigarh Fort sits on the ridge directly above Amber Fort, connected by a long underground passage, and was the military strongpoint that defended the entire Amber area. Where Amber is palatial and decorative, Jaigarh is strictly functional — massive walls, watchtowers, and a foundry complex where cannons were cast.
The star attraction is the Jaivana cannon, mounted on a platform with its enormous barrel pointing out over the hills. At 20 feet long and weighing about 50 tons, it is the largest wheeled cannon in the world and has never been fired in battle. The foundry itself, where it was cast, is still intact and remarkably interesting.
The views from the walls are excellent — you look down onto Amber Fort below and out over Maota Lake and the desert plains. The joint ticket with Amber Fort makes this an easy add-on. You can walk the fortified wall between the two forts.