That's Crystal Cave, a longtime favorite of people who celebrate subterranea. Crystal Cave is the second biggest of the 275 "known" caves in Sequoia National Park, it boasts "delicate crystal ...

Hang around long enough in Santa Barbara, the mystical mountainside coastal city known as the American Riviera, and someone will inevitably regale you with semi-true tales about the tunnels under ...

Miners drilling through limestone in Chihuahua, Mexico, broke into an extraordinary chamber in 2000 and found something that defied geological expectations: gypsum crystals taller than telephone poles ...