#GrandCanyonNationalPark is the United States' 15th oldest national park. Named a UNESCO World Heritage Site in 1979, the park is located in Arizona. The park's central feature is the Grand Canyon, a gorge of the Colorado River, which is often considered one of the Seven Natural Wonders of the World. The park covers 1,217,262 acres of unincorporated area in Coconino and Mohave counties. Grand Canyon National Park was named as an official national park in 1919, but the landmark had been well known to Americans for over thirty years prior. In 1903, President Theodore Roosevelt visited the site and said: "The Grand Canyon fills me with awe. It is beyond comparison and beyond description; absolutely unparalleled throughout the wide world... Let this great wonder of nature remain as it now is. Do nothing to mar its grandeur, sublimity and loveliness. You cannot improve on it. But what you can do is to keep it for your children, your children's children, and all who come after you. It is the one great sight that everyone should see." (Image copyrights belong to their respective owners)