In the southwest of the old town, the most striking building of the former city fortifications, the so-called "Wolf Tower", is clearly visible. The tower, which is around 20 metres high and built in a three-quarter round shape up to the height of the former city wall, has two floors. It was built in the middle of the 14th century, when, following the granting of city rights, a city fortification with walls, around 15 towers and gates could be built.
This unusually large tower served - as well as an observation point - as a prison and, during the witch hunts from 1628 to 1632, as a dungeon for women and children suspected of witchcraft. From the end of the 18th century, the city fortifications were selectively demolished because they were no longer up to date due to the range and penetrating power of modern artillery weapons. The "Wolf Tower" initially survived this phase unscathed. Nevertheless, the ravages of time took their toll on the building, so that in 1876 it was almost demolished because it was in danger of collapsing. However, the city council decided to carry out an initial renovation in order to preserve this striking tower as a cultural asset. During the second-to-last renovation in 1969, the tower was also converted into an event venue. It is furnished; there are toilets and a kitchen, but private use is not possible.