This sounds like a really exciting adventure @leaky20! This is the first time I've heard of the Catacombs. My first impression of those bones and skulls seemed creepy to me at first. But then as I read and listened to your story, it started to sound cooler and cooler! I imagine that the inside of the cave/tunnel was cold in temperature.
I feel sorry for all the people who had to die. It's interesting how you mentioned that the bones were well-preserved. I was also surprised at the end when you mentioned that they checked your bag for stolen bones. I wonder what would happen if they caught you with a bone in your bag?!