Metz Cathedral: Exterior detail, northern facade with Tour du Chapitre

It is an unusual building: the towers are grafted on to the fourth bay of the nave instead of being part of the fa\u00E7ade; there is a 20th-century portal in the fa\u00E7ade, but the four original portals open into the aisles; and two secondary apses project to the south at 90\u00B0 to the nave. It originally comprised two separate churches oriented at right angles to one another. The nave is very high and Rayonnant in style. The cathedral possesses a large expanse of stained glass windows, dating from the 14th through 20th centuries (those by Marc Chagall).