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The San Francisco Volcanic Field north of Flagstaff encompasses 2,000 square miles of fascinating geological phenomena, including ancient volcanoes, cinder cones, valleys carved by water and ice, and the San Francisco Peaks themselves, some of which soar to almost 13,000 feet. There are also some of the most extensive Native American dwellings in the Southwest: don't miss Sunset Crater
and Wupatki. These national monuments can be explored in relative solitude during much of the year. The area is short on services, so fill up on gas and consider taking a picnic.