One of the highlights of my US roadtrip was seeing Arches National Park. Arriving just before sunrise allowed for some unique shots and also just an amazing sight as the sun came up to make the red, steep mountains and rock-formation look like they caught fire.
However, it is often the unexpected shots that catch the best feeling, in my experience anyway. Like this shot taken by my friend as I walked that just happened to catch a hot air balloon on the background.