This old collegiate church of St Cassius and Florentius has developed on the site of a place of worship dating back to the second half of the 3C. Note how the current building bears the mark of the Romanesque and Gothic styles, here combined harmoniously. Note the baptismal fonts and sculptures at the chancel entrance, in Romanesque style. Spend time visiting the Romanesque cloister, reputed to be the best preserved of its epoch in Germany