GUINOBATAN, Philippines — Mount Mayon, one of the Philippines’ most active volcanoes, is as renowned for its beauty as it is feared for its destructiveness. Admired for its symmetry and classic cone ...

Follow a team of volcano sleuths as they embark on a worldwide hunt for an elusive volcanic mega-eruption that plunged medieval Earth into a deep freeze. The mystery begins when archaeologists find a ...

Prologue : A very bad day on Planet Earth -- 1. Mystery of the missing megavolcano. Serendipity ; Frozen in the ice ; Data in Davy Jones's locker ; Blowing the case wide open ; Mystery solved -- 2.

In this 360° video from the Sierra Nevadas' Long Valley Caldera and Antarctica's Mount Erebus, see how volcanoes belch carbon dioxide and other gases into the atmosphere, which has slowly changed ...