Stashed away in Sequoia National Park are over 240 caves with maybe hundreds more undiscovered. One of the most amazing is Lilburn Cave, a marble labyrinth and California's deepest cave at over 20 ...

Giant crystals found in Naica min in Chihuahua, Mexico stand up to 36 feet tall and have measured over three feet wide. NASA/METI/AIST/Japan Space Systems, and U.S./Japan ASTER Science Team ...

There's no shortage of caves and caverns available to visit in the state of Pennsylvania. Each location delivers on wow-factors and the chance to learn, spend time together, enjoy the great outdoors ...

It's estimated that the North Atlantic island of Bermuda has more caves per square mile than anywhere else, and their ...

They push into the outer limits of Pettyjohn Cave, aiming for ground almost nobody reaches. The crawl is tight and ugly, then the light hits stone and everything changes. Rare crystals start flashing ...

This is quite possibly the most heart-stopping and best clips we’ve ever received for Expedition Unknown this season! Pic credit: Discovery Deep in the jungles of Honduras, there is a special place ...

Exploring the underwater caves of Egypt's Red Sea is an adventure like no other. The caves, which are home to a plethora of ...