If you’ve ever been on a cave tour where the guide shines a black light, you’ve seen the walls and formations glow. The stunning fluorescence is often the result of impurities trapped in calcite rocks ...

These outer space bunkers may provide the perfect conditions for preserving life ...

The Great Basin National Park was rated as one of the most disappointing parks in the country. Here's what isn't disappointing about the park.

NASA has claimed that a huge hole on Mars could be a "portal" leading to an underground world of alien life. The space agency shared a photo of the opening in the Martian landscape as part of its ...

When the summer sun is blazing, there’s no better way to cool off than by heading underground. Caves offer a naturally air-conditioned escape, along with a chance to explore some of the Earth’s most ...