The former church of Saint-Didier in Courcelles-en-Montagne must have dated from the early 13th century. Today's building dates from January 1867 (when work was completed). It has an elongated floor plan and comprises a three-span nave with four bays, a tower-porch framed by two chapels and crowned by a polygonal slate-roofed spire, and a choir with a straight bay followed by a three-sided apse covered by a six-quarter rib vault.
Eglise Saint-Didier de Courcelles-en-Montagne