Accomlished skiers and mountaineers, Christina Lustenberger and Guillaume Pierrel become the first to climb and ski Mt. Robon's technical south face.

A red-hot lava flow two miles long has been attracting crowds to the slopes of Mount Etna on the island of Sicily, Italy.

A unique combination of sand and snow transformed a Colorado national park into an otherworldly winter wonderland, a stunning photo shows. The phenomenon occurs about once a week in Great Sand ...