The front of this former Benedictine abbey church (1782) is framed by two tall towers. It was the Eupen-Malmédy diocese cathedral from 1921 to 1925. The interior has interesting furnishings and fine artifacts. Note the 18C carved pulpit, late 17C confessionals, 17C Virgin by Delcour, wooden St Quirin reliquary (1698) and silver bust-reliquaries of St Gereon and his companions.