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 ...

Early herdsmen were using a volcanic lava cave to shelter from the fierce desert ... Within the lava tube are artifacts, rock art, and skeletal remains that document repeated human occupation ...

Passing by a series of subterranean geological features named cave chocolate, cave bacon and cave popcorn, I start to wonder ...