Below Paris exist galeries remaining from the old limestone quarries, which date from the beginning of the XIIIth century. At the end of the XVIIIth century, the General Inspection of the Quarries was created to repair and fortify the city streets, as well as to draw up exact maps of the more than 250 km of mysterious tunnels. That official map has now been created but there also exist other maps made by illegal explorers of the catacombs (named “cataphiles”) in order to move more easily through the underground streets.