I love this. I've always wanted to visit the catacombs...im a huge history buff, and the first time i heard about this, i freaked and looked up all i could...this just put that spark back in me.
I've always wanted to go to Paris for the catacombs! You might want to look at the Sedlec Ossuary in the Czech Republic. It's a church filled with everything from a chandelier to the artist's signature made of human bones.