The medieval belfry measures 83 m in height and is inclined by 87 cm to the east. At its top there is a viewpoint from which you can observe the panorama of the city and its surroundings. To get to it, you need to climb a steep staircase consisting of 366 steps. The tower was inscribed on the UNESCO World Heritage List.
The belfry was built in 1240. It consisted then of a stone building crowned with a wooden spire. It served as a treasury and city archive. Over the centuries, the building was destroyed several times by fires. The most serious ones took place in 1280, 1493 and 1741. The currently visible gothic crown of the tower dates from the first half of the 19th century.
The belfry was tilted for the first time in the 13th century. In the middle of the 16th century, for fear of collapsing, its construction was reinforced with powerful pillars. A thorough renovation was also carried out in the years 1964-1971.