Definitely worth a visit to the Bremen Town Hall. Keep in mind that guided tours are only available at certain times, which can be clarified on the Town Hall website.
Admission: 6.5 EUR, free of charge for children under 11 years old.
You can walk through the halls where the Senate once sat and go down to the real medieval wine cellar, where the Bremer Ratskeller restaurant, the same age as the Town Hall, is now located. There are about 600 varieties of alcoholic beverages, the oldest of which was produced in 1723.