Our tour of the Paris Catacombs was truly unique - and our guide was entertaining and made it a lot of fun. However, be sure to plan to spend the entire morning - about four hours total - for the tour. Initially, we thought we were signing up for a one-hour tour and were surprised at how long it turned out to be. Also, there are lots of steps - almost 200 down at the start and almost 100 back up at the end so, if you're not fit, this isn't for you. If you can do the stairs, though, it's an experience unlike any other you'll have in Paris!