This underground natural wonder is an amazing spectacle that resembles the awe-inspiring cascades of Niagara Falls within Mammoth Cave National Park.

A major rescue operation is underway in a cave northeast of the Italian city of Bergamo to free a woman who was injured in a fall and became trapped while exploring with eight other people.

A man found frozen in a Pennsylvania cave in 1977 has finally been identified, closing the book on a nearly 50-year-long mystery.