Slottensgade led to Korsør Castle, which has now been demolished. The castle gave the street its name (the Danish word "slot" means castle). During 300 years when crossings to Fyn started from the southern part of the town, Slottensgade was home to boat owners and sailors, as well as officials from the postal service and customs authorities. At that time, the street also contained numerous hostels for travellers. Several of the houses in the street date back to the 1700s, having been built following one of the fires that often swept through towns in ages past. Many of the houses are built of stone from the now demolished Korsør Castle. Number 5 Slottensgade is the address of the "White Swan", a very old hostel with a white swan over the door. Number 1 Slottensgade is the address of "Postgården", at one time the finest hostelry in town, which could be seen from afar on the waters of the Great Belt. Many a traveller has spent the night here, and many have taken a cup of coffee and a little food here to recover from the worst effects of seasickness. The old building has recently been restored to its former glory, only now it contains modern, well-furnished apartments. Until 1920, the waters of the Great Belt came all the way op to the end of Slottensgade. The marina and the naval station are built on reclaimed land.