Glacier National Park, Montana- I have actually been here. Would not mind at all going again. If you would like to go, be sure to schedule your trip on the west side of the park, that is where it is the most beautiful.
We're aware of the Grand Canyon in Arizona, but there's another lesser-known sight — the Havasu Falls — that you shouldn't miss out on. The red rocks and vibrant blue waters make a really stunning contrast.