catacombes de paris - catacombs of paris (off-limit area)

Catacombs of Paris (off-limit area), about 20 meters (60 feet) underground, under Paris city center.­

This is a part of the 200 Km network of ancient tunnels not opened to the public, but regularly visited by trespassing urban cavers called "cataphiles".­ See more information in the description of the photo album.