Start from RER station courtyard, from "Le Raincy" side. Take the allée de Gagny up to the Boulevard du Midi. Turn left on the allée de l’Ermitage. Follow the allée de l’Ermitage up to number 15. Take on your left the allée Gambetta, turn right in the avenue de la Résistance up to Notre-Dame church.
It was built in 1923 to commemorate the first Marne battle victory by the french architects Auguste and Gustave Perret. It is the first church built from armed concrete on its own. On entering, the atmosphere is dominated by the color of the magnificent stained glass, warm tones near the entry progressing to a deep blue tone in the apse.