At Camila's I read the article on the Paris Catacombs in the February 2011 issue of National Geographic. I had thought that the article would only appeal to those who like looking at skeletons but it wasn't at all about that. Instead the article talked about the great underground mining of Paris: there were open limestone and gypsum quarries on the outskirts of ancient Paris and as Paris grew, they continued to mine the limestone and gypsum underground so that there are tunnels throughout the left bank. Periodically the ground will collapse and at one time, the cadavers in Paris's overcrowded cemeteries were dug up and used as fill. The city government has to keep an eye on the various tunnels to make sure they are not going to collapse. (Sounds sort of like Western Pennsylvania...)
The magazine has a map of the tunnels and its website has an interactive map as well as photos and a list of websites and organizations that will help you explore them. The magazine also has a cut-away view of the ground under Paris, showing the metros, the quarries, the sewers, the aqueducts and water table but I can't find that on the website.The story was a collaboration between National Geographic and NPR and you can read another story about it on NPR: Life Below The City Of Light: Paris Underground and even watch a video (just click on the photo).
It is amazing that there are 180 miles of underground tunnels but I don't think I want to descend any time soon. I'm content to do my walking above ground.














































