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

Emma Bushee's sons were serving on six continents. At home, she waited for their letters — and tried to pray them home safe.

A mysterious 170-foot-deep hole hidden in the woods led us to something incredible. In this video, we uncover the story behind this massive pit and how it resulted in the discovery of giant, naturally ...

At a site known as Natural Trap Cave, a team of scientists are rappelling down to uncover the secrets of what the Earth was ...