Visitors can wind their way through a network of tunnels 20 metres under the ground, where six million Parisians are buried.
Between the end of the XVIIIth century and Haussmann's modernization of Paris, bones from the capital's cemeteries were taken to the old Montrouge quarries which became the Catacombes in 1810.
The arrangement of the bones brings death to light and a number of texts taken from a variety of traditional Western sources provide food for thought.