The Catacombs of Paris are located in the 14th arrondissement.
The catacombs consist several underground cemeteries connected by tunnels, which hold the remains of more than six million people.
Around 1780, Cimetière des Innocent (then the cemetery within the city walls of Paris) was closed. The bones and bones of Parisians buried there were transferred to the catacombs under the city. From 1785, the other Paris cemeteries were transferred
The tunnels are over 290 kilometres long, but only 2 kilometres are open to visit.