Gusky points at some graffiti in the Cite Souterraine, or Underground City.
Jeffrey Gusky, left, escorts a visitor through the Cite Souterraine.
Gusky points out an engraving to a visitor. He began photographing the site last December.
In medieval times, villagers hid from marauders in this cave.
Gusky examines an etching left by a WWI soldier.
A sign engraved with names directed military occupants to various locations in the Cite Souterraine cave.
Nearly 2,000 century-old inscriptions have recently come to light in Naours.
A historian says the graffiti "provides insight into how (soldiers) found a sense of meaning in the conflict."
The site's proximity to the Somme battlefields, where more than a million men were killed or wounded, adds to the discovery's importance.
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