A large arch at the entrance to the underground quarry of Eragny.

An ancient culture of fungus on stacks in the underground quarry of Herblay Conflans Sainte Honorine.

An ancient culture of fungus on stacks in the underground quarry of Herblay Conflans Sainte Honorine.

Numerous blocks of stone carved into the underground quarry Keppler.

In the highest corridors of the underground quarry Mello. Almost 20m ceiling.

In the assembly area V1 missiles underground quarry of Saint Leu Esserent. The cabinets were probably used to store the heads of the missiles.

Corridor in the underground quarry of Eragny.

A portion of the settling ponds of the underground quarry lions at Louveciennes.

A flyer of a visitor in the underground quarries.

A flyer of a visitor in the underground quarries.