It has been centuries since lava flowed through this particular cave. Caver Chris Heinlein stands in Kazumura on the remnants of a lava pond. It was created when gas-filled lava pooled in one spot ...

Approximately 700,000 years ago when molten rock erupted from a vent in nearby Hart Prairie, the mile-long Lava River Cave was formed. Today, visitors can explore the cave's cool, dark expanse by ...

Turns out, millennia ago, ancient people also sought refuge from a punishing landscape in cave-like volcanic lava tubes that lay scattered across the Arabian Peninsula. From the Neolithic ...