Lavacicles, a common feature, are squeezed out of a lava tube’s roof by gases under high pressure and then cooled mid-drip. The gooey appearance of a rock wall in Manu Nui cave was formed when ...

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 ...

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

Hallmundarhraun, just a few hours’ drive from Reykjavík, is riven with lava tubes which form when fresh molten rock flows through ... But the cave is no minor feature. It is giant-scaled, ...

Advance reservations are required. Make a day of it when exploring Fort Rock and head northeast a bit to this 1,200-foot cave and lava tube. Its 30-foot ceiling and 50-foot width are spacious are ...