A short walk north of the city walls brings you to Galgberget — the Gallows Hill. Three weathered limestone spires stand on the bare rise, the only remaining medieval execution site in Europe with its original triple-gallows structure intact. In its working centuries, criminals were strung from horizontal wooden beams between the stones; the bones often stayed where they fell, and 19th-century antiquarians dug up dozens of skeletons in the surrounding ground.
The hill itself is now an open park with sweeping views back to the city walls and across to the Baltic. Bring a flask of coffee for a strangely contemplative spot — half memento mori, half picnic ground.