The church, the monastery's largest building, stood in this vast, now empty area until 1792. With its 106 metre long, 28 metre high nave, the church was approximately the same size as the cathedral in Soissons.
It is still possible to gain an idea of the church's floor plan. The foundations of a choir with seven radiating chapels are visible on the park side of the area; in the south, the wall separating the church from the cloister is intact. Fragments of columns and capitals suggest the width of the nave and the side aisles. The northern transept turret - which has remained standing - bears witness to the quality of the masonry and architectural design of the whole. It also gives an idea of the interior height of the transept with its openings.
Opposite the turret, on the wall of the southern transept arm, a fragment of red stucco drapery marks the spot where the tomb of Prince Henri de Lorraine stood (it is now in the refectory). A passage used by the monks (the red door) leads into the cloister.

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| | © Michel Chassat |
These capitals, placed in the choir of the church, are an excellent illustration of the sobriety of Cistercian décor.

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