The Danube bastion was the center of the fort. Its original function was to protect the Danube, so this is the strongest bastion of the Fort Monostor. The walls here are most imposing, and are up to 5 meters thick and 15-18 meters high.
From top of the bastion you have a beautiful view of the Danube and of the both sections of the mayor fortress system in Hungary and Slovakia. On the roof there is also a concrete artillery emplacement constructed by the Soviets.
In the assembly ground in the middle, today seasonal open-air theatres and concerts will take place.
Inside the impressive building a narrow railway with small carts can be seen in many places. This was used by the Soviet army for transporting crates of ammunition, but some sections of it may be older.