Grand Canyon National Park
Theodore Roosevelt created the Grand Canyon National Monument in 1908, but it didn't become a National Park until 1919. Obviously, the Park's central feature is the Grand Canyon, a gorge of the Colorado River, which is often considered one of the Wonders of the World. Unique combinations of geologic color and erosional forms decorate a canyon that is 277 river miles long, up to 18 miles wide, and a mile deep. Grand Canyon overwhelms our senses through its immense size.