This place of worship is a real work of art, but above all it is a renowned pilgrimage site. Since 1329 it has harboured the venerated saint's body, which is dressed in priestly clothes and laid to rest in a glass case.

Many great artists have celebrated the life of Saint Roseline : Marc CHAGALL, with an remarkable mosaic representing the Angel's Meal. Jean BAZAINE and Raoul UBAC, with their flamboyant stained glass. Diego GIACOMETTI, with a relief sculpture and a bronze lectern. An altarpiece of the Bréa school represents Saint Roseline and her parents, the Marquis and the Marquise of Villeneuve, in a nativity scene.

The chapel is open to the public every afternoon except Mondays.

The faithful from all over the world meet in the chapel several times a year for pilgrimages, the most important of which are the 17th January (Roseline's saints day) and the first Sunday of August.