Paris Catacombs - A World Beneath the City 

There is a world beneath the city of Paris and it includes the Paris Catacombs which houses one of the world's largest ossuaries. An ossuary can be a small chest or box, a building, or a dedicated site used as the final resting place for human skeletal remains. The Paris Catacombs are just part of the underground world of Paris which includes subterranean Métro tunnels, sewers, and the deepest of all, a network of abandoned quarries. It is part of the these underground quarries that contain the famous ossuary, Le Catacombes de Paris (the Paris Catacombs).