The first mention of 'Korsør' dates from 1241, and it is from this period that the medieval tower dates. The tower - part of a complex of buildings that constituted Korsør Castle - was demolished in the early 1800s.
The Great Magazine was constructed by order of Christian IV around 1610. On the first floor Korsør Town and Crossing Museum can be found. On the ground floor function as Korsør Town’s exhibition and event centre, while the basement and top floors serve as storage for the Museum’s extensive collections.
The Local History Archives for Korsør and Environs are located in the 'Commandants Residence' – a wood-faced, half-timbered building from the 1720s - as well as the adjoining harbourmasters residence dating from 1884.
The red-painted half-timbered house across from the tower dates from 1826, and was originally built for the storage of gun carriages. The building has, over the years, served variously as a youth hostel and a museum. Today it is the meeting place of the Marine Society as well as housing their historic collection.
The small guardhouse from the mid 19th century serves as a coffee house in the summer time. The ramparts surrounding the fortress area were constructed by order of the Swedish, during their occupation of Korsør from 1658-60.The fortress area bears the marks of many different historical periods, making it a site of unique historical interest.
References:Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.