Formed in the Pleistocene, roughly 675,000 years ago, this 0.75-mile-long lava tube is remarkable for its length and tall ceilings; at some points, the roof is more than 30 feet above your head. That is a bit unusual in my experience.



Formed in the Pleistocene, roughly 675,000 years ago, this 0.75-mile-long lava tube is remarkable for its length and tall ceilings; at some points, the roof is more than 30 feet above your head. That is a bit unusual in my experience.