Munger fort is the most important and popular fort created on a rocky eminence projecting to river Ganga that wrapped from west and partly from the north. Munger fort covers an area of 222 acres and has a route of 2½ miles. The rampart is 30’ thick having 4 inner wall and 12’ outer wall. The fortification was provided by four gateways with circular and octagonal fortress at regular intervals, carrying the usual battlements. Lal Darwaza is preserved with some designable curved stone, which originally belonged to Hindu and Buddhist structure. During social conflict at the time of Lord Clive, the fort was garrisoned by some external force. The fortifications are not being properly maintained and thus turned into ruins to a large extend. The inside of the fort is gradually changed for civilian use.
Within the fort, there is some prominent structure accountable in a making Munger as well as Bihar a worth place to tour. Inside the Munger Fort there remains two hillocks and an old platform in front of Bungalow exists near the hill. Munger does not form significantly during the first Muslim invasion of Bihar under Ikhtiyar Khan Khilji. There remains a strong controversy regarding the history and original founder of the Munger fort. After a through investigation some scholars comes with the view that the fort was built during the time of early Muhammedan kings of India.