The bottoms of Paris represent, not to doubt it, a threat for the constructions of surface. But they are fascinating because they represent a consequent page of our history and entice more and more of curious.

Catacombs were at the origin of the stone-pit which were of use to the extraction of the necessary stone to build the town (limestone and plaster).

Then they were of use to the revolutionaries, the poachers, smugglers and bandits. Finally they accommodated subterranean laboratories, mushroom beds (the famous mushrooms of Paris!) breweries and sculptors' studios(workshops), and was a height - place of the Resistance with him(it,her) P. C. de Rol-Tanguy, in August, 1944, in the careers of the place Denfert-Rochereau. (4)

Carrière médiévale du Val-de-Grâce  (5^ième arr.).

In 1 777 the General Inspection of the Stone-pit is creates to watch the basement and warn the collapses due to the clear space. Consolidations and organizations were begun and continue even nowadays. There is even a card in 1/1 000 of the subterranean galleries, retort of the network of surface.

Catacombs, literally (ossuary sheltering more than six million skeletons), were fitted out to allow the visit of the public and are situated under Val-de-Grâce or the Look-out post.

Carrière de Port-Mahon (14^ième arr.).