Hells Canyon is the deepest river canyon in the United States. Now scientists have solved the mystery of when it formed.

We went deeper than ever before. In this video, we push the outer limits of Pettyjohns Cave, navigating tight crawls, massive chambers, and eerie silence that only gets more intense the farther you go ...

The works of more than 50 sculptors are being featured in a trail 100ft (30m) beneath the ground in caves this summer. Back ...

A team of researchers has uncovered a new species of crustacean deep within a limestone cave in Bermuda—a find that could ...

Clay Jordan, Sequoia and Kings Canyon National Parks superintendent, said the reopening of Crystal Cave is not only a ...

Built into a limestone hill, the 358 steps leading up to the cave opens up to a Buddhist temple that holds a 40-foot tall golden statue of Buddha, surrounded by statues and painted art adorning the ...

Samsung . Samsung has brought back an incredible buy one get one free deal on gaming monitors. Right now, the 49-inch Samsung ...

Republicans say the 1,000-page-plus bill is what voters sent them to accomplish. Critics say it adds to deficits while ...

Who needs fantasy? Earth is full of "alien planets" and surreal beauty beyond imagination. These 30 photos showcase the most ...