The underground quarries are often in labyrinthine network with long branches. Man has dug the cavities in order to take building stone. The underground quarries are in general large, with irregular shape and without any facilities dug on the walls. The little rural quarry made in order to take building stone can have only one hoisting shaft and some cavities around. On the contrary, the quarries used for big constructions like castles or cathedrals can stretch as far as more than 1 km. In some French regions like Loire valley and Bordeaux, men have been digging the rock during several centuries and they left huge underground areas.