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Built on Karlskrona's main square by prisoners of war as a punishment, the Trefaldighetskyrkan is a cute yellow church with a spectacular interior dome - like a wooden version of Rome's pantheon.
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A railway was built through the hill containing the town square to link the main railway to the naval reserve. It's no longer used, but the tunnels can be viewed from several points. On the north side near the town park is best as you can walk up to the gates.
In parkland south of the main square is this yellow clock tower. Several of the defunct railway tunnels can be viewed from nearby.
A temporary church built in 1681, it remains as a striking red wooden building down a lane surrounded by the naval reserve. In front is a statue of Rosenbom, a vagrant who froze to death. Lift his hat and insert a coin to assuage yourself of guilt about ignoring homeless people.
A large rock connected by bridge to Trossö, Stakholm has 360-degree views and is a popular sunset picnic spot.
A very large maritime museum on the waterfront with spectacular vistas. Most of the exhibits are in Swedish, so be sure to pick up an audio guide. The exhibits consist principally of a very large and impressive collection of wooden ship models, and life-size interiors of ships that can be walked through. In addition to the museum itself, the complex houses a very popular smorgasbord that you'll find packed with Swedes from around 11:30 onwards, and a gift shop. Outside the museum you'll also find some disused ships/submarines that are worth a look, and Karlskrona's famous lighthouse.