The catacombs of Paris are a fascinatingly morbid historic attraction, where you go deep underground to explore passageways ...

Deep in the heart of Paris, a series of underground tunnels ... since vanished from collective memory – abandoned basements, catacombs, and subways hundreds of miles apart.

Behind the neat stack of skulls, tibias, and femurs in the Paris catacombs lies a chaos of bones ... where cool air sighs up from their secret entrance. As we approach, a mud-covered man climbs ...