The stacks of a former mushroom bed in the underground quarry of Bazemont.

Photography in relief. Thank you to Argonaut for the second camera.

Thanks to Argonaute for the lights (and to be so crazy to get down the hole with his candles)

Quarries of Paris - The network located in the Val de Grace hospital.

The old quarries of the Val de Grace are medieval. They were exploited from the 13th century to 16th century.

In 1621, Anne of Austria asked Louis XIII transfer Benedictine nuns of the Convent of Bievre in Paris. The venue was the current location of the Val de Grace.

In 1638, the architect Francois Mansart began construction of a church and an abbey. In digging the foundations, he discovers that he is above old underground quarries. These voids are surveyed, mapped and consolidated. But Mansart spending too much money and who is the architect Lemercier completed the job.

For the purposes of work, workers have built a staircase to the underground quarries and give the name of Mansart.

A abandonned mushrooms culture, with bags, in the quarry of Montesson.

Photography in relief. Thank you to Argonaut for the second camera.

A big plunge into the void. At the bottom of the image, the tower "mirrors", and my old office, for the first time from above. This photo was published in the book Babel Tower, the work of master edition of foreign literature at the University of the Sorbonne.

Quarries of Paris - The mineralogical showroom on Rue Saint Jacques.

The most famous staircase of Paris. One of the showroom mineralogical layers of Rue Saint Jacques. It has been degraded and restored many times. One thing is sure. It was there before us. It will be there after (even for the weak).

The quarry Montesson was used (as often) for the cultivation of mushrooms. The quarry belongs to the set of quarries of the plain of Montesson.

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

I used to be guide for cops in the Saint-Leu quarry. Photography done with their autorisation, of course!

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.