In 1542 Småland rebel Nils Dacke spent Christmas in Kronobergs Slott, now a ruin. The 14th-century castle is on a small island (reached by footbridge) in Helgasjön, about 8km north of the town. Boat trips on S/S Thor , Sweden's oldest steamship, built in 1887, leave from below the ruins. Take bus 1B from town.