Lava River Cave

Top 9% of attractions in Flagstaff

7 / 10

“Subterranean lava flow formed this mile-long cave roughly 700,000 years ago.”

– Fodor's

Atlas Obscura

"Eons ago, a rushing lava river formed this pristine passage through solid rock. " Full review

Coconino Naional Forest, Flagstaff, AZ