Carved plate indicating the (ancien) district of Paris: "Municipalité du XIIeme arrondissement (12th district). The star above the number 262 indicates that the plate was carved during or after the revolution. Plates carved before 1789 have a lis flower instead.
This location is now part of the 6eme arrondissement (6th district) of Paris.
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 album description.
This photo was taken using the 180mm Raynox fisheye extension. The barrel distorsion was later corrected in Photoshop using the Panorama-tools plugin filters.