Flagstaff's Lava Tubes preserve unique natural wonders associated with volcanic lava flow in the Arizona region, formed via a volcanic vent located near Hart Prairie. The unique 700,000-year-old formations created tubelike tunnel formations from the flow of lava, cooling into a mile-long tunnel that hardened completely and can be explored throughout the year on foot today. The cave stretches for approximately three-quarters of a mile and stays a cool 35-45 degrees Fahrenheit year-round due to its unique natural protection and composition. Instead of traditional stalagmites and stalactites that are showcased in limestone caves, the lava tubes are home to lavascicle and splashdown formations created from liquid rock frozen in motion as lava cooled. Visitors should bring several sources of light when exploring the lava tube, as the tube creates pitch black conditions that can be easy to get lost in if one light source fails.

171B Forest Rd, Flagstaff, AZ 86001

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