From Grand Canyon to Petrified Forest to Saguaro National Park, here are the best things to do in Arizona's most beautiful places.

Sunset Crater Volcano National Monument is open 24 hours; the visitor center is open daily from 9 a.m. to 4:30 p.m. The park charges $25 for a private vehicle entrance; those entering the park on ...

National Park Service sites that charge entry fees are offering free admission on MLK Day. In Arizona, these include ... monuments like Sunset Crater Volcano in Flagstaff and Montezuma Castle ...