Your guide, an English-speaking local expert, will lead your group into the 200-mile labyrinth of bone-lined galleries and former quarry tunnels. At the entrance, an inscription reads, “Arrête! C’est ici l’empire de la mort” – “Stop! Here lies the empire of death.” Here, you’ll see remains of dignitaries like Rabelais and Robespierre, among over 6 million former Parisians. While standard visits stick to public routes, your guide takes you beyond the usual path. Discover hidden sites like Gilbert’s Tomb and the Port Mahon Gallery, where an 18th-century quarry worker secretly carved sculptures over five years before a tragic cave-in. You’ll also see the Quarryman’s Footbath and the Sepulchral Lamp, whose flame reassured workers that the air was safe. As you explore, your guide brings to life the history, legends, and mysteries of this underground world. After this journey 65 feet beneath Paris, you’ll never see the city the same way again.