1. Grand Canyon National Park in Arizona

    Arizona’s Grand Canyon is famous in part for its lack of people (except for those massing tourists around the national park’s viewing platforms). But this vast geological wonderland has been inhabited by humans for upwards of 12,000 years. Archaeological digs have uncovered Puebloan tribal sites offering evidence that people not only passed through the Grand Canyon in ancient eras, but actually called the riverbank and caves home. The Havasupai tribe began to settle in the area some eight centuries ago and their descendants are residents of the Grand Canyon to this day.

    This massive gorge of the Colorado River has been a US national park for only a comparatively short period of time – since February of 1919.