At the end of a restoration at Notre-Dame de Paris and at the beginning of that of a stained glass of Notre-Dame de Chartres, here is the opportunity to discover and compare stained glass of cathedrals whose techniques of realization and alterations are different. Young people are welcome. Photos are not allowed. The visit slots (upon prior registration by email) are 9am-10am, 10am-11am, 12pm-1pm in the morning, 2pm-3pm, 3:30pm-4:30pm, 5pm-6pm in the afternoon. Friday visits are reserved for school children via the "Les Enfants du Patrimoine" operation. We look forward to meeting you...