The underground quarries beneath the city of Paris have been a mirror and memorial of events for over 500 years, with a long tradition of writing and painting on the walls. This book explores the diversity of visual statements that successive generations have left behind in these fantastic (and often phantasmagoric) images and words. In the 1780s bones from the Cemetery of the Innocents were stored in the old tunnels as the result of cemetery overcrowding. As the city population soared, skeletons from other cemeteries followed the move underground, and with-them came formal inscriptions, graffiti and other artifacts. Images on the walls remind us that during World War II, both the French Resistance and the German forces made use of the underground labyrinths. Since the 1970's, Paris has experienced a marked increase in illicit underground exploration in these fascinating but off-limit areas of the tunnels. Many of the explorers have left elaborate artworks behind them. All these generations of images, and more, are brought to light together for the first time.