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

The city of Flagstaff has taken big steps to preserve the clarity of its night sky. Find out the best ways to experience the ...

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 ...

Its namesake feature, the 10,457-foot Lassen Peak, is one of the world's largest lava dome-type volcanoes and the southernmost active volcano in the Cascade Range.

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 ...