The Jaivan cannon, preserved at the Jaigarh Fort in Rajasthan's Jaipur, is considered the largest wheeled cannon ever constructed. It can be rotated on a robust four-wheeled carriage. The length of the Jaivan cannon is 31 feet 3 inches and it weighs about 250 tonnes. Over 100 kilograms of gunpowder was needed to fire the Jaivan. (Video Credit: ANI)