Also known as the Great Gun meaning the Destroyer of the World, Jahan Kosha is a cannon that is placed in the Topekhana near the Katra Mosque. The canon is maintained by Archeological Survey of India. The cannon was lifted four feet off the ground. Many people were shocked to see the big and cumbersome cannon swinging at the height of 4 feet. Later it was free from the tree's roots. The cannon made of ashtadahatu or 8 metals, namely silver, gold, lead, copper, zinc, tin, iron, and mercury. The cannon is 7 ton heavy and 12 feet in length.