A military fort place under the train station of Saint-Lazare. There's still some germans signs on the wall, describing the use of a ventilation machine.

Bedienungsanweisung:
1_ Hebel am vordereren Rohr auf
2_ Anlage betätigen mittels Fahrrad oder mittels Motor. Hebel auf Ein
3_ Hebel auf Aus
4_ Hebel am vorderen Rohr auf

They explain how the ventilation system works, with a bike or a car.

Where there is light, there is life

Mushroom area in a gypsum quarry, exploited on stacks

The SEBILLOTTE quarry was operated from 1838 until 1940. Then, the quarry has been used for growing mushrooms until 1960. There are still beautiful mushroom beds in most rooms of operation.

There are only heavy structures in buildings.

An old fan, to ventilate the quarry, when there was the mushrooms culture in the quarry.

The floor 27a of the tower CB31. There is no access for the stage 27 occupies 2 levels over its entire surface.

there are many concretions.

There is so many flying buttress, they can't put anymore!

Inside the old aquarium of the Trocadéro. There is a new one now.

Although there 5m ³ discovered human bones in 1959 during renovation of underground tunnels, it is clear that these underground were not intended to be catacombs, discovered the ossuary is merely an anecdotal reuse of the network.