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 ...

The Cave of Crystals is an underground cavern filled with tree-size gypsum crystals, including some of the largest natural crystals ever found. The cave is located around 980 feet (300 meters) deep ...

Deep within the outer reaches of Pettyjohn Cave, explorers uncovered an extraordinary crystal formation hidden far from known ...

Wisconsin is home to 50 state parks and 18 National Natural Landmarks. We’ve also got a village known as the troll capital of the world! With so many unexpected adventures and places to discover, why ...

Deep beneath the sun-scorched plains of northern Mexico, an astonishing underground cave defies belief. In the heart of the Naica Mine, a silver and lead extraction site in Chihuahua, miners once ...