Crypte Archéologique

Beneath the large square in front of Notre Dame lies an archaeological crypt. The 117m-long and 28m-wide area displays the remains of structures built on this site during the Gallo-Roman period, a 4th-century enclosure wall, the foundations of the medieval foundlings hospice and original sewers sunk by Haussmann. In 2020, the crypt reopened after Notre Dame's catastrophic 2019 fire with an exhibition on the cathedral's 19th-century revival following the publication of Victor Hugo's novel The Hunchback of Notre Dame.