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An architect I knew in Paris once pointed out to me that everything that the entire built environment in Paris was quarried from the limestone beneath it; there's as much of the city below ground as there is above it.

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Architect from Paris here. That’s right, except the mines didn’t cover all of Paris, they were originally outside and eventually built over. [1] The underground networks below Paris are actually said to be even more extensive than the streets and extend many stories deep. These networks are the result of a complex layering of quarries, catacombs, sewers, bunkers, undergound metro, and even waterways [2], large parts of which have been abandoned over time. No public map is available, who knows what else might be hiding there.

[1] https://en.wikipedia.org/wiki/Mines_of_Paris [2]https://commons.wikimedia.org/wiki/File:Le_Canal_Saint-Marti...

I DJ'ed a rave once in one of the off-limits sections of the quarries under the Right Bank (Auteil maybe?) Insane acoustics.

Absolutely. Here's a map of the catacombs of Paris overlaid on a real map of Paris.

https://i.imgur.com/6ywDpJX.jpeg

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