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.

Tickets will soon be available for guided tours of Crystal Cave, one of the most popular visitor attractions inside Sequoia National Park. Crystal Cave is described as one of the Sierra Nevada's most ...

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 ...