Some of the most amazing spectacles around the world are hidden deep underground, beneath rocks, sea and even ice.

Idaho National Parks include seven drastically different park properties. This includes a small portion of the world's f ...

HONOLULU (AP) — A fountain of lava was spewing from a Hawaii volcano Tuesday in the latest episode of an eruption that has paused and resumed. Fountains from a vent of the Kilauea volcano on Hawaii's ...

The two-hour “Archway Explorer″⁣ is the lava tubes’ 101 tour and takes us down a set of steps into the mouth of a yawning cave ... bed of the dry Robertson River. Below us, weeping ...

The national park protects these sacred caves, restricting public access to preserve their cultural and environmental importance. Lava tubes could ... the Tsauchab River from flowing any further.

The enchanting dunescape stretches over 43 miles (70 km) along the coast and over 30 miles (50 km) inland. Lençois translates ...

Spectacular timelapse footage from January 27 captured the lava flows spreading like a river delta on the crater ... Human Life in This Vast Lava Tube Cave The 5 most common deathbed regrets ...

"Lava tubes really represent, from a technical perspective, an extension of the work we've done in other subterranean environments, like underground mine sites and caves," Fred said. That work inc ...

Spectacular timelapse footage from January 27 captured the lava flows spreading like a river delta on the crater floor. Experts are monitoring the volcano amid its heightened unrest.