The Oratory’s archives contain a unique treasure: a collection of 10,000 photographs, taken mainly at the Oratory and dating from 1904 to 1980. Created by the religious of the Congregation of Holy Cross, as part of their duties at the shrine, this collection presents different aspects of the Oratory’s history: the evolution of the site, the life of Brother André, the employees, important visitors, small and large events, etc. These were subdivided into 307 thematic series a few decades ago.