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 ...

In 1926, the remote area was mapped by European cartographer László Almásy who stumbled upon two "side-by-side shallow caves" adorned with hundreds of rock paintings of animals and humans, including ...

For most people, scuba diving in Mexico is an exciting vacation adventure. For Fernando Calderon Gutierrez, it’s just another day at the (underwater) office. A postdoctoral research assistant at Texas ...