In honor of the National Park Service's 105th anniversary, we're focusing on Arizona's national park sites this month. As park ranger Brenda Emry explains, Sunset Crater Volcano National Monument is unique for many reasons. | Arizona Highways Magazine

Roughly 950 years ago, Sunset Crater Volcano erupted in northern Arizona, and the eruption could be seen from as far as Las Vegas, Tucson, and Durango, Colorado! Check out Arizona's youngest volcano: | ABC15 Arizona