Vietnam's Son Doong, the world's largest cave passage, started its life millions of years ago as a crack the width of a piece ...

This week's 60 Minutes takes viewers deep into the largest known cave passage in the world. The journey was one of the most ...

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

For the hermit monks of Karoulia, the most remote area of Mount Athos, climbing dangerous rocks and prayer are a part of daily life.