I have always been fascinated by cathedrals and churches. They often were started in one century and then finished in another. They're architecture is amazing, and mind-boggling. Of course, I would love to see the Sistine Chapel in person. I've seen so many photos of it, as well as tv documentaries and such, that I almost can see it with my eyes closed.

What are some of the other cathedrals and churches you'd like to see, and why?