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A 20-m tower that was built in the 12th century as part of the town's defence wall. The interior is only accessible as part of a "fairy tale" event - for adults May-Sep every Friday at 19:00 and for children during the summer holidays (beginning of Aug- beginning of September) every Tuesday 10:30.
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Climb the lighthouse (33 m). Views are great from that height.
Altes Rathaus
Construction started in 1422 and took about 14 years to complete. Make sure to also look at the south facade.
Constructed in 1380 as part of the city walls. It was also used as a prison, hence the name.