For the last 6 years Korsør hosted tourists from 9 cruise ships. The town is situated around a harbour which for centuries has been an important part of its inhabitants' daily life. To move from the southern part of the town to the northern, or vice versa, citizens have to pass over a bridge which at certain times of the day will be raised in order to let ships in or out of the fiord. Boats, vessels, merchant ships and the occasional cruise liner are regular visitors.
Close to Korsør there are a number of historic remains from times of unrest. On the isle of "Sprogø" and near "Tårnborg" walls and patterns in the ground confirm the existence of two castles from the twelfth century meant to control the passage through the Great Belt. – Close to the town centre are the remains of Korsør Castle from the thirteenth century with its impressive old tower still intact and two miles north of Korsør entrenchments from the war with Sweden in 1658 are still visible.