The Grand Canyon, Arizona. I was in Las Vegas for the weekend and drove here during the day. It's a very very long drive
up a long straight road that's pretty much the only entrance from the South. But it is definitely worth it. Definitely. If you do what I did
it will knock you sideways. Walk up to the edge but don't look at it while walking up, keep looking at the ground.
Then when you get to the edge, grab a hold of the railing and close your eyes. Lift your head up, then open your eyes.