Through the intricate study of lava tubes—caves formed following volcanic eruptions when lava cools down—an international team of researchers has uncovered clues about Earth's ancient environments ...

Through the intricate study of lava tubes -- caves formed following volcanic eruptions when lava cools down -- an international team of researchers has uncovered clues about Earth's ancient ...

The Chauvet-Pont D'Arc cave is one of the most famous underground caverns in the world, housing one of the oldest and best-preserved collections of prehistoric cave paintings ever discovered. Now, ...

Just a four-hour drive from Melbourne, the Byaduk Caves are a mind-blowing underground network stretching for around 24,000 metres ...

Editor’s note: A version of this story appeared in CNN’s Wonder Theory science newsletter. To get it in your inbox, sign up for free here. A mile and a half beneath the ocean’s surface, the seafloor ...

Oregon has no shortage of staggering natural beauty, from prominent icons like Mount Hood to under-the-radar marvels like the secret "Iceland-esque" Abiqua Falls just south of Portland. Yet Oregon's ...

“A major eruption could happen literally any day now; it’s about 50-60 years overdue.” Paulina Anna, a geologist at the aptly-named Lava Centre in Hvolsvöllur, on Iceland’s southern coast, is ...

A mysterious pit on the flank of an ancient volcano on Mars has generated excitement recently because of what it could reveal beneath the surface of the Red Planet. Here's what that means. First ...

One the John Muir's finest pieces--and one of my favorite pieces of writing--is about surviving a sudden snowstorm with the help of fumaroles. The whole thing is very much worth reading. Our ...