It's funny how you have no idea of the scale of some things. The Space Shuttles fall into this category. You know intellectually that a rocket is a pretty big thing, but you don't really appreciate the size until you stand next to one.
Douglas Adams (of The Hitchhiker's Guide to the Galaxy fame) said it best:
Space is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space.
Camera: Nikon D70s
Location: U.S. Space & Rocket Center, Huntsville, AL