Iceland's unique volcanic and glacial landscapes offer plenty of adventurous outings, including exploring otherworldly ...

After a four-year closure, Crystal Cave is inviting visitors to "marvel at its underground splendor," Sequoia Parks ...

After four years of closure, Crystal Cave is reopening this month in Sequoia National Park. Learn why it was closed, how to ...

Others are not only off the grid but beneath it, in the hundreds of caves that lead to vast subterranean spaces. Local, state and federal law enforcement have continued to scour the region around ...

Tickets will not be available for purchase at Crystal Cave. Crystal Cave, the second-largest of 275 known caves in Sequoia and Kings Canyon National Parks and the fourth-largest in California ...

and at least 275 total caves in Sequoia and Kings Canyon National Parks alone. A walk through the drip-echoed walls of the marble-carved Crystal Cave establishes its reputation as extraordinary.

Jesse James, moonshiners, and generations of outlaws have used the Ozarks' cave systems as hiding places. The Blanchard Springs Caverns, a vast limestone cave system, is about 18 miles south of ...