The 4 city gates

Impressive vestiges of the two medieval walls, the monumental gates protected the city while signifying its importance. The Clock Tower, or "Zittgloeckel", is situated beyond the City Hall. With the School Tower, it formed part of the first fortifications, built in the early 13th century. A second rampart, built in the 13th and 14th centuries, featured 8 towers and 3 gates, of which the Low Gate, to the east, and the Lion Gate, to the north, still remain.