Whether it’s 100 degrees or below-freezing, these caverns in the Sierra Nevada foothills stay at a constant temperature for ...

Black Chasm Cavern is one of Earth’s rarest creations. Although the Indigenous people of California likely stumbled onto it long before, the first recorded sighting was in the 1850s when the hills ...

The first person to peer into the 18-inch crack in an Amador County hillside got quite the surprise. The gap swallowed the sunlight, exhaling sweet, cool air. Translucent pillars flushed orange in the ...

Under the Earth. Near the town of volcano in the Sierra Nevada's gold country is a rare spot on Earth, a vertical cave some 4000 ft long. This is a look inside the Black Chasm Cavern, first documented ...

(KTXL) On the surface, Black Chasm National Landmark is the perfect playground for sightseers and outdoor enthusiasts being located next to the small town of Volcano, surrounded by miles of forest and ...