Hokusai's Giant Wave Graffiti in an area known as the "Bar des Rats".

On the left, Corps blanc or l'homme blanc, by Jérôme Mesnager

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.