The City Hall, located off the Prinzipalmarkt, is one of the most important achievements of Gothic profane architecture and reconstructed in full historic detail. The building from the middle of the 14th century was reconstructed in the 1950s, true to the original.

Today it is the site of council meetings, festivities and concerts, and a reception area where the mayor greets visitors to the city. The Treaty of Westphalia was signed in the council chambers, known as the Friedensaal (Hall of Peace).