8Grand Canyon National Park, Arizona

No list of must-visit parks would be complete without the Grand Canyon, a geological marvel that offers breathtaking views of layered red rock formations. The canyon, carved by the Colorado River over millions of years, stretches 277 miles long and reaches depths of over a mile.

Visitors can marvel at the canyon from lookout points along the South and North Rims, hike down to the river, or experience it from above with a helicopter tour. The Grand Canyon offers an unparalleled experience that leaves visitors awestruck at the power of nature.