Travel around the world for a firsthand look at volcanoes - perhaps the most dazzling but destructive natural force on earth. Massive volcanic eruption can turn day into night, releasing the power of an atomic blast, spewing toxic avalanches of lava, gas, and ash. National Geographic Video transports you to some of the world's most notorious volcanoes, including Mount Pinatubo in the Philippines and Japan's Mount Unzen. Join volcanologists in their dangerous quest to forecast eruptions and save ...