On the top of the Lantern tower, in the center of the cathedral. The main towers behind, in the front of the cathedral are empty.

Setting up a photo exhibition in the underground quarry of Saint-Leu d'Esserent by Arnaud.

Photo by G. Arnaud. The photographs can be viewed on the personal website.

Extraction of the Stone follows the geological slope. At the bottom of the galleries, a flat corridor allows to evacuate materials by truck. On the right, a horizontal corridor connects two superimposed levels.

A beautiful underground sandpit, on two levels.

Old photograph of the underground quarry of Saint-Paul-Trois-Chateau. The stone blocks are mounted on carriages, ready to be lowered to the bottom of the hill for shipping.

This sandpit on two levels is very fragile.

One of the building changing rooms of the Renault factory. One per floor, for hundreds of workers.

In the tallest building was the assembling of vehicles. On the right, under the siren, the locker rooms of the workers.

The limestone quarry of Chanaz is a smaller operating on three levels. The ceiling height is between 5 and 10m. Sometimes, holes in the floor let you see underground levels.

The network size is almost 4km developed. It was exploited from 1860 to the end of the Second World War to make cement. Portions was reused as mushroom farm thereafter (row crops and cultures in bags).

In this photo taken at the highest level, we see the intermediate level, row crop bottom right and even two holes overlooking the lower level. This is the most impressive part of the network with large volumes!

The sandstone is a soft rock found throughout the Lower Dauphiné, where it is often the only building stone. This underground quarry is one of the major mining sites in the Drôme.Exploitées since ancient times, these quarries supplied the materials to major projects such as the medieval cathedral of Valencia College Saint-Barnard de Romans. Still used for the construction of the Canal de la Bourne in 1877, molasses is used less and less irreversibly from that time, mainly because of competition from cement.