Yellowstone National Park. Was nice, but way too crowded for me, next time I think I will go get a backcountry permit and stay away from all the tourists and see it somewhat how the people who mapped and sketched it did.
One of the biggest natural tourist attractions in the United States, the Grand Canyon is a deep, massive, picturesque canyon in Arizona. According to UNESCO, "its horizontal strata retrace the geological history of the past two billion years."
How to Visit All 50 States in 12 Trips - This free e-book has itineraries for 12 trips that take you to all 50 states. Each is filled with kid-friendly attractions and must-see sights all over the country. Written by the author of Travel 50 States with Kids and Adventures Around Cincinnati.