A bit hard to find, it is one of the most popular places for Catholics to visit here in Paris. Site of the reported apparitions of the Blessed Virgin Mary to a young nun, Catherine Laboure, in the 1850's it draws thousands of pilgrims every year. It was here that the Miraculous Medal originated. You can see her incorrupt body to the right of the altar. For devout Catholics this is a major attraction. Miraculous Medals are available for purchase from the nuns here. A bit hard to find, just around the corner from Bon Marche department store.