Sweden's proudest sailing fleet was created at the Gamla Örlogsvarvet. The old shipyard area forms part of the Karlskrona World Heritage Site, which is on the UNESCO World Heritage List. Here you will find, among relatively modern buildings, a variety of buildings and technology covering more than 300 years of shipbuilding. The most eye-catching buildings on Lindholmen are the Wasaskjulet, Polhemsdockan, and Repslagarbanan—Sweden's longest wooden building dating from 1692. There is also a tour that takes you to Lindholmen by sea. This shows you Karlskrona from the seaside and takes you out to the former naval yard. You can only visit Lindholmen with a guided tour. During the summer there are regular tours, contact the tourist office to arrange tours at other times.

This fort has defended the entrance to Karlskrona for more than 300 years. Kungsholms Fort is still operational within the Swedish defences. The remarkable round harbour has become somewhat of a symbol for Karlskrona’s status as a World Heritage site. Exotic plants from all corners of the globe flourish under the protection of the fort’s walls. They have been brought here over many years on vessels returning from distant voyages. A museum on the island depicts the fort’s history. There are regular guided tours to Kungsholms Fort during the summer, visits can also be arranged for groups and individuals at other times.