Grand Canyon-The Spoiler

There is NOTHING that prepares you for your first look at the Grand Canyon. Approaching it seems like a gentle rise and it seems impossible that you could be near something that is supposed to be very deep. Just a few steps and the bottom literally drops out.
My first realization was that I was standing very close to the edge and there was no gaurd rail. The hole that you are looking into is a mile deep. A slight wind made it even more scarey. If you fall you have a lot of time to think about it before you hit.
My favorite quote from Ian Rankin; "You know you can fall from any height you want. It's just the last half inch that's fatal."