It sounds amazing Brian, maybe next time I am over that direction I will make a point of going. I enjoyed the catacombs in Paris last time I was there. Here I am with a few hundred thousand friends!
I didn't find it creepy, it didn't seem to have an 'atmosphere' to me it was more like they were no longer there and had 'moved on'. I found it incredibly interesting and went back a second time to see some areas I'd missed. There are miles of it but only certain areas have public access. Because of my cemetery work I have been offered a private tour by one of the people who are allowed to roam freely down there which I hope to take up at some point. It's weird to think that some people actually still live in the catacombs (illegally) and have even had parties down there.