Find hidden crystals and explore curious alien legends at this Arkansas gem, perfect for families, explorers, and treasure ...

Add Yahoo as a preferred source to see more of our stories on Google. The interior of the Cave of Crystals in Mexico with a person for scale. The Cave of Crystals is an underground cavern filled with ...

What started as a filthy sinkhole packed with trash, tires, razor blades, and mud turned into something no one expected.

More than 900 feet beneath a mountain in northern Mexico, there’s a hidden chamber that almost doesn’t look real. Massive, glass-like crystals stretch in every direction, some as long as a city bus.