Naica’s Crystals Cave, maybe the most amazing underground wonder on Earth, was discovered by chance inside the deep mine of Naica, in the State of Chihuahua, Mexico. It is a true geode ... ranging ...

The largest crystal found in the cave measures ... for similar organisms to exist on other planets. The Cave of Crystals in ...

Explorers as a part of the Great Maya Aquifer Project discovered a connection between two large underwater caverns on the Yucatan Peninsula. When combined, the two systems formed a 215-mile-long ...