Munger Fort has a long history of different dynasties and rulers controlling it. It has a number of historic and religious monuments.

The Munger Fort, located at Munger, is built on a rocky hillock on the south bank of the Ganges River. Its history is not completely dated but it is believed that it was built during the early rule of Slave dynasty of India. The Munger town where the fort is situated was under the control of Muhammad bin Tughluq of Delhi (1325-1351 CE). The fort has two prominent hills called the Karnachaura or Karanchaura, and the other a built-up rectangular mound deduced to be the location of a citadel of the fort with historical links. The Fort had a succession of Muslim rulers (Khaljis, Tughlaqs, Lodis, Nawabs of Bengal), followed by Mughal rulers, till it was finally acceded to the British by Mir Quasim (1760–72), after unseating his father-in-law Mīr Jafar on the grounds of old age, for a monetary reward negotiated by Vansittart. This deal involved payment by the East India Company’s merchants of an ad valorem duty of 9 percent, against an Indian merchant’s duty of 40%. The fort became a place of considerable importance to the British in Bengal till India’s independence in 1947.

The fort houses a number of religious and historic monuments such as the Tomb of Pir Shah Nufa (died 1497), Palace of Shah Suja, Tomb of Mulla Muhammad Said (died 1704 CE), the Kashtaharini Ghat on the Ganges River, Chandisthana (an ancient temple) and an 18th century British cemetery. In recent times, a famous School of Yoga has been established here.

Under the Mughal rule, the fort was substantially expanded as a strong military fortification. The fort was an impressive structure with massive gates, one of which had been a strong fortification with square towers, with a deep moat. The moat was 175 feet (53 m) in width, surrounding the land side of the fort, thus making it strategically formidable. It opens to the Ganges river (which is 2 kilometres (1.2 mi) wide here but crossed only by boats) at either end thus enhancing the fort's security.

The fort is spread over an area of 222 acres (90 ha) over rocky hills with a peripheral length of 2.5 miles (4.0 km). The fort has 4 feet (1.2 m) thick inner walls while the outer walls are 12 feet (3.7 m) thick forming the fortification, which is 30 feet (9.1 m) thick. The intervening space of 14 feet (4.3 m) between the inner and outer walls is filled with earth. The Ganges river hugs the fort walls on the west and partly in the north. On the landward side, there is 175 feet (53 m) wide moat, which acts as a defense to the fortifications. There are four entry gates, within the octagonal fortress, with ramparts. The main gateway, called the Lal Darwaja, is still in good shape, even though the rest of the fort is mostly in ruins. This gate has a carved stone, which is said to belong to a Hindu or a Buddhist structure.