The castle was built just north of the old town center on a small island at the entrance to the city in the 14th century under Valdemar Atterdag, where it replaced an older plant called Tårnborg further inside Korsør Nor. During the Karl Gustav wars from 1657-1660, the Swedes converted part of the sentence with cannon bastions, in order to better control the navigation on the Great Belt . The castle was demolished in the 1700s instead of establishing a battery. The castle's two fleets were demolished in 1812. Among the preserved parts of the earthquakes, several bastions, a three-story...

The castle was built just north of the old town center on a small island at the entrance to the city in the 14th century under Valdemar Atterdag, where it replaced an older plant called Tårnborg further inside Korsør Nor. During the Karl Gustav wars from 1657-1660, the Swedes converted part of the sentence with cannon bastions, in order to better control the navigation on the Great Belt . The castle was demolished in the 1700s instead of establishing a battery. The castle's two fleets were demolished in 1812. Among the preserved parts of the earthquakes, several bastions, a three-story half-timbered building from around 1610, which was built by Christian 4th, and the large fortress tower of approx. 25 m, which together with the walking tower in Vordingborg are the only preserved fortress towers in Denmark that date from the Middle Ages.