In the fall and winter, when Cape Cod takes on a quieter character, the salt cave becomes a cozy sanctuary from cold weather ...

Underground caves made entirely of salt where you can recline in a zero-gravity chair and breathe like you’re on a European ...

What started as a filthy sinkhole packed with trash, tires, razor blades, and mud turned into something no one expected. After hours of digging, they finally broke through into a hidden cave system ...

Explore 15 of the best secret nature spots in the U.S. that are off the beaten path. Discover your next quiet escape with ...

Illustrating showing Thomas Edison holding graphene on the left and a man with safety goggles holding a large blue crystal on ...

While exploring caves along a riverbank, a group followed a tunnel that quickly led deep underground. The passage opened into massive chambers filled with crystal formations and towering limestone ...

At 210-feet underground, a stay in this Arizona hotel room included unrestricted access to an ancient cave system. Why new ...

More than 900 feet beneath a mountain in northern Mexico, there’s a hidden chamber that almost doesn’t look real. Massive, glass-like crystals stretch in every direction, some as long as a city bus.

In Cairn you will come to a cave full of glowing crystals made of Piton-proof hard stone that has a ledge high above the cave and a seemingly impossible route to get to it. Above is a great prize, the ...

Deep inside a mountain along the scenic Blue Ridge Parkway lies a natural wonder most travelers never expect to find. Imagine walking through ancient limestone passages where every drip of water has ...