This giant circular structure was built as a granary by the British in 1786. You can climb up the staircase to the top to get this lovely view of the Ganga. Alarmed by the famine of 1770, Captain John Garstin built this huge granary for the British army in 1786. The massive structure is 29 m high and the walls are 3.6 m wide at the base, located near the Gandhi Maidan. It is huge and is in the shape of a beehive.