This was the former church of the abbey of the Holy Sepulchre and was only made a cathedral after the French Revolution. It was built at the beginning of the 18th century in the classical style and resembles the cathedral of Arras, which was built at the same time. The nave, which has five bays, is flanked by side aisles and runs up to a transept that is closed by two chapels that serve as an apse. The trompe-l'œil grisaille frescoes in the chapels were painted about 1760 by the Flemish artist Martin Geeraert. The choir, which is surrounded by an ambulatory.