Lava River Cave
What the experts agree on
A mile-long underground passage carved by lava 700,000 years ago, this geological wonder offers a rare glimpse into volcanic history beneath Flagstaff's surface.
“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
