Rhineland and Italy. An outstanding factor in Mosan architecture is the closed west front (westwerk). Unfortunately, some of the largest churches, notably Liège cathedral, and the Stavelot and Sint-Truiden abbeys, were destroyed. Former collegiate church St Bartholomew, Liège Former collegiate church of St. Denis (Liège) Former collegiate church St John, Liège Former collegiate church of Our Lady, Huy Former collegiate church Saint George and Saint Ode, Amay Former collegiate church Saint Étienne, Waha Former collegiate church of Fosses-la-Ville Former abbey church of Saint Gertrude, Nivelles Former abbey church of Saint Ursmer, Lobbes Former abbey church of Celles Basilica of Saint Servatius, Maastricht Basilica of Our Lady, Maastricht Former abbey church, Aldeneik Former abbey church, Rolduc Former abbey church, Susteren Former abbey church, Sint Odiliënberg Munsterkerk, Roermond Aachen Cathedral (westwork) Stone carving Mosan stone carving reached a peak in the 12th century in Maastricht, Liège and Nivelles. Maastricht 'metsen' (stone carvers) worked on capitals and reliefs as far afield as Utrecht, Bonn and Eisenach. Carved capitals in western galleries of Basilica of Saint Servatius, Maastricht (12th century) Carved capitals in East choir of Basilica of Our Lady, Maastricht (12th century) Carved capitals in crypt of abbey church of Rolduc (12th century) Vierge de Dom Rupert (12th century), Curtius Museum, Liège Pierre Boudon relief (12th century), Curtius Museum, Liège Samson Portal, Collegiate Church of Saint Gertrude, Nivelles Baptismal font, Furnaux (Namur) Oath on the Relics relief (12th century), Basilica of Our Lady, Maastricht Majestas Domini tympanum (12th century), Basilica of Saint Servatius, Maastricht Double relief choir screen (12th century), Basilica of Saint Servatius, Maastricht Four-part relief in Saint Peter's Church, Utrecht Metalwork Metalwork has been considered the high art of the 12th and early 13th-century Meuse region, culminating in the work of Nicholas of Verdun, which is of exceptionally high quality. The Shrine of the Three Kings at Cologne Cathedral, the Anno Shrine in Siegburg and the Shrine of Our Lady in Tournai are among his best work. Other important metalworkers were Renier de Huy and Hugo d'Oignies. Baptismal font at St Bartholomew's Church, Liège (early 12th century) by Renier de Huy Shrine of Saint Servatius (±1165) in Maastricht Shrine of Saint Hadelin (1170, partly 11th century) in Visé Shrine of Saint Remacle in Stavelot Shrines of Saint Domitian and Saint Mangold (by Godefroid de Huy, ±1172-1189) in Huy Shrine of Our Lady (1205) at Tournai Cathedral by Nicholas of Verdun Shrine