The Invisible City Beneath Paris
newyorker.comExtremely well written, informative, and sometimes terrifying, this is a great piece.
I wish there were more movies involving the Catacombs. There are a couple... but not nearly enough, IMHO. The most known probably being "As Above, So Below".
Agreed, and that one wasn't very good. Last time I was in Paris we waited about 3 hours in line until a helpful gentleman came through the line to tell everyone we wouldn't reach the front before they closed for the day.
We went to the music museum (new and incredible) instead.