This vast 14C Flamboyant Gothic church has an imposing tower adorned with a 9m-diameter rose window. Unusually for Belgium, the apse is flanked by two square towers. The treasury has a rich collection of Mosan silver and goldware. Its four magnificent 12C and 13C reliquaries include some attributed to Godefroy de Huy. The 14C Bethlehem doorway has a tympanum depicting a Nativity scene and, above it, the Massacre of the Innocents.