The most accurate 3D images of the interior of a volcano, Axial volcano off Oregon's coast, ever captured have implications ...

One of the most fascinating underground attractions in Pennsylvania is Penn's Cave, and it's one you can tour by boat.

Buried beneath a Central American lake, these Mayan ruins weren't discovered until 1996 when a scuba diver found an ancient, ...

The Ozarks are famous for their majestic beauty, but beneath the surface in northwest Arkansas is an underrated attraction that never sees the light of day.

Nestled in the Ozark Mountains near the Missouri border, Cosmic Cavern isn’t just another tourist trap with a few stalactites and a gift shop selling rock candy. No, my friends, this is the real deal ...

Just 30 minutes north of Austin, beneath the rolling hills of Georgetown, lies a subterranean realm that feels more like stepping into a fantasy novel than a Texas attraction.