This fort is situated on the banks of river Hooghly and is named after King William III. The fort occupies five square kilometers of area and has six gates namely Chowringhee, Plassey, Calcutta, Water gate, St Georges and the Treasury Gate. The Arsenal inside, is worth visiting for which a prior permission is required from the Commanding Officer. This fort was built by Robert Clive in the year 1781.Today this fort is the property of the Indian Army with a provision to accommodate 10,000 army personnel. The fort still stands as before, except the St. Peter’s Church which no longer exists. The fort is built in a shape of an octagon. A telephone office, recreation club, canteen, cinema hall, restaurant, swimming pool and wide moat surround it. A museum inside the fort consists of arms and armors, swords, muskets and machine guns kept on display for the visitors.