Those wagons are not anymore in the quarry while the quarry is still closed down...

The ladders are quite weird! The viaduct Garabit has ladders of helical form.

Underground Clermont-Ferrand are dug in the tuff. The tuff is consolidated volcanic ash, easy to dig. Sometimes you may discover metamorphic rock inside the tuff. This is this kind of rock you can see on the left of the photo. Useless and too heavy, it was left in the underground.

A beautiful gallery carved into the tuff of Clermont. Strata are clearly visible.

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.

According to various persistent rumors, the galeries network could be open to the public in the near future, and maybe offering the preservation it deserves.

Meanwhile, various underground openings are bringing the presence of taggers. The most paradoxical is that these openings are often carried out by lovers of heritage assets and they open to vandals every time.

Fish bones (also abbreviated ADP) are part of a network of much larger gallery, called Fantasques, due to the name of a road, above the galleries. As its name suggests, the network looks vaguely to a structure of a wheat. In fact, it is a network of parallels arranged around two dorsals (or main roads) with an orthonormal structure, much like certain Nazca archaeological symbols, or even a TV antenna, but definitively not like fish bones.
The main feature of these undergrounds is their purpose was not to drain water, unlike the other two parts of the network (The Colinettes and large galleries). Most galleries are straight, flat, millstone, with dry soil, with the notable exception of the main corridors, steep slope with many stairs.

Those pillars are very modern.

So do i, a flyer with many puns in it. Hard to translate.

First visit in the french comedy. It was very hard to light the room with our small LED light...