Fort Monostor (Hungarian: Monostori Erőd) (also referred to as Fort Sandberg) is a fort is situated close to the city of Komárno, Slovakia. It was built between 1850 and 1871.
After World War II the Soviets built the biggest ammunition storage in the Fortress of Monostor. Thousands of wagons of ammunition were forwarded from the strictly guarded objects. One of a series of forts in the area, Monostor is open to the public as a museum.
