Beneath the surface of a quiet river, we found an entrance that led us into a vast underground world. The deeper we went, the ...

The journey gets even wilder in Part 2 as we tackle a 280-foot waterfall rappel deep inside a hidden river cave. It’s one of ...

Lake Melissani on the Greek island of Kefalonia, also known as Melissani Cave, is among the most astonishing lakes in the ...