On the left end of northern Arizona's San Francisco Peaks sits a dormant, 12,000-foot-tall volcano known as Humphrey's Peak. It's not just the elevation that makes this mountain special ...

If you want the best views of San Francisco, take a hike to Twin Peaks. These famous grassy peaks rise 922 feet in elevation, making them the second highest point in the city (after Mount Davidson).

Sunset Crater sits in the larger San Francisco Volcanic Field, which also produced the nearby San Francisco Peaks (a mountain range that, among other things, contains the highest point in Arizona).