This building, called a cathedral, is in fact a collegiate church, whose construction, begun in 1421, was completed only in 1893 with the erection of the tower, the highest in the country (100m). The tympanum of the main door, by E. Küng, is a remarkable illustration of the Last Judgement. After climbing 254 steps inside, you will reach the top of the tower, from where you can enjoy a magnificent panorama over the city.