When my travel buddy suggested we go to the catacombs I was really excited! It is the biggest crypt in the world with the bones of over 6 million people!
In the 17th century Paris‘ graveyards were so full that dead bodies were literally overflowing from them. By the 18th century their solution to this was to take the remains and put them in old mining tunnels five stories underground (it took 12 years to move them all!).
During different parts of world war 2, both the Nazis and French resistance had bunkers in the tunnels.
Today it’s a tourist attraction, a morbid one, maybe, but it was really incredible down there! The line to get in was worth it (but if you can, try to get tickets online ahead of time!).
The Catacombs cover 4.2 square miles underneath the Paris streets. A dark maze of skulls and bones. Some with graffiti on them dating back to the 18th century!