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The double ambulatory is famed for its forest of 'palm tree' vaulting, which meets at the end in a unique spiral column that inspired a series of paintings by Robert Delaunay. The bell tower, a survivor from one of the earlier churches on the site, has the oldest bell in Paris (1412). Around the nave are stained-glass windows dating from the 14th and 15th centuries (most of those in the side chapels are by 19th-century Chartres master Emile Hersh), and the choir apse has striking stained glass designed by artist Jean René Bazaine in the 1960s. Next door, around the former cemetery, is the only remaining charnel house in Paris.