With high carbon dioxide, low oxygen and no photosynthesis, here’s how an entire ecosystem persists in Movile Cave, one of the most extreme environments on Earth.

A subscriber just showed us a deep cave on his property, and we couldn't resist exploring it! After hiking through the woods for about 40 minutes, we arrived at the massive pit, and from the looks of ...

In 1885, white rioters murdered dozens of their Asian neighbors in Rock Springs, Wyoming. A hundred and forty years later, ...

James Larkin White, 18-year-old cowhand, discover in 1901 the world’s greatest and most spectacular underground wonder, ...