This program offers a unique and adventurous way to explore the hidden and mysterious underground world of Paris. The visit includes a tour through the underground quarries, followed by a visit to the catacombs, where visitors can witness the romantic-macabre decor. After a mandatory passage through the sewers, the tour concludes with a visit to the incredible bunker hidden under the Gare de l'Est. The visit is led by passionate connoisseurs, making it a fun and exciting way to explore the lesser-known curiosities of Paris.