As can be seen regularly written on the pillars, this very orthonormal quarry is numbered. Here, a small pond and a referral to the delight of most visitors photographers.

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

"The mine"

The slope goes down in the lower level that can make the connection with the largest sectors. Warning, the quarry and especially this level is full of holes in all kind. So please pay attention, thank you.

This part of the cathedral is more modern. In fact, it's the boiler room of the cathedral that has been camouflaged. In cold weather (below zero), a large plume of steam rises and can spin like a snake between the columns to the side. It's pretty fun, unless you want to take pictures.

There are statues of saints in the niches at the bottom of the buttresses. On the left side, a niche remained empty because you can not see inside the ground. This is optimization!

Reservoirs of the Plaine Saint-Denis (here, the smallest tank), located under the France stadium are one of the largest type of construction. It can hold up to 165.000m ³ of water. The irregular shape of the pillars is due to the construction technique by molding (digging the soil, concrete injection and clearing the land around the pillar).