The Catacombs of Paris

A subterranean labyrinth lies twenty meters below the earth, beneath the heart of gorgeous Paris. This meandering network of small corridors and gloomy halls was created centuries ago out of the stone used to build the city. They house the ashes of millions of Parisians who were relocated from their original burial sites after the city's graveyards were closed due to public health concerns in the eighteenth and nineteenth centuries.

The bones in the ossuary are arranged in a fairly horrific exhibition of typical Romantic preferences, and when tourists begin the two-kilometer walk through the tunnels, they are welcomed by the poem "Arrête, c'est ici l'empire de la death" (Halt, here is the kingdom of Death). The trip takes around 45 minutes to complete and is pretty impressive, but not for the faint of heart.

Location: Paris, France