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 ...

Giant crystals that can reach sizes larger than houses grow at incredibly slow rates, taking as long as a million years to reach more than two stories tall, scientists now find. Crystals made of ...

CONCEALED 1,000ft below the ground lies a treacherous cavern filled with enormous crystals capable of killing visitors in a matter of minutes. Anchored to the walls of the blistering hot cave that is ...

There are plenty of natural wonders in the world that are actually incredibly dangerous. The Blue Hole of Santa Rosa, for example, is an unassuming New Mexico lake that's actually a death trap, hiding ...