How well do you know the national parks of the Southwest? — QUIZ
The National Park Service marks its 100th year on Aug. 25. It was created by an act signed by President Woodrow Wilson in 1916.
The system, which includes 412 areas, saw more than 307 million visitors in 2015.
So how much do you know about national parks in the Southwest United States?
Take the quiz below to find out!