Prior to this discovery, the largest underground thermal lake title belonged to a site in Hungary, below Turkish baths in the ...

Blurring the line between reality and fantasy, these unique natural wonders prove that nature is the ultimate artist.

two of the top three largest known caves in the world. To get there, a punishing path and 90 percent humidity test even the fittest hiker. A walk for the fortunate few: Only a limited number of ...

When Floyd Collins ventured into Sand Cave in Kentucky on Jan. 30, 1925, he was searching for the next big attraction. But he never made it out alive.

The death of a Kentucky cave explorer a century ago is being remembered as a catalyst for the formation of Mammoth Cave ...

Scientists have discovered a fungus that turns spiders into “zombies,” luring the arachnids out of their lairs before killing ...

Discover these caves in Alabama — hidden underground wonders that offer unforgettable adventures beneath the surface!