I agree. Edinburgh has some amazing ones under The Royal Mile.
The Paris ones used to be quite extensive but the comments here make me wonder if they have been shortened?
The catacombs in Lima gave me pause. The environment there is very dry and so decomposition is presumably slowed. There was a very distinctive smell.
[1] https://en.wikipedia.org/wiki/Mines_of_Paris [2]https://commons.wikimedia.org/wiki/File:Le_Canal_Saint-Marti...
Excited to see what will come from this study over the next years, this was my favorite place to see in Paris last year, and wasn't too hard to schedule the visit (I think I booked one or two days before). Some sections are closed, and I read the catacombs are not fully mapped. Wondering if they will find something or someone long thought to be lost down there.
Here's a guided tour of the closed portion by a knowledgable enthusiast: https://youtu.be/O3ufzGxfW6Y
here's a short (20 min) French language mini-documentary about the pastime of people who go to the catacombs. https://youtu.be/nRISC0cJwMU
It documents a real project they undertook to uncover and infiltrate the location of the WWII Nazi bunker for the purposes of producing a Rave. The rave had electricity that they were able to secretly install by jack hammering through a meter thick concrete wall.
For a real tour showcasing a few of the organized rooms: https://www.youtube.com/watch?v=6Q8Hw3XCwhs
A interesting aspect of the Catacombs is that some Parisians have dug their own tunnels and added various objects in the rooms.