Saint-Thomas is the principal Protestant church in Strasbourg, a massive five-aisled Romanesque-Gothic structure that dominates the western end of the Grande Île. It is mainly visited for two things: the famous Silbermann organ, which Mozart played in 1778 and which remains one of the finest historic organs in France, and the extraordinary baroque mausoleum of Marshal Maurice de Saxe.
The mausoleum, by Jean-Baptiste Pigalle, fills an entire bay of the nave. De Saxe, one of the great commanders of 18th-century Europe, is shown descending into his tomb while weeping allegorical figures surround him. It is a piece of theatrical baroque that is out of all proportion to a Protestant church, and all the more striking for it. Regular organ concerts are held; check the schedule at the church entrance.