Deadly Shadow of Vesuvius The shattered remnants of the Roman city of Pompeii bear witness to the risk that the people of Naples still face today.
Descent Into the Ice A team of "glacionauts" ventures into a labyrinth of unexplored and hazardous glacier caves on France's Mt. Blanc.
Fire Wars Wildland firefighters battle one of the most destructive fire seasons in U.S. history.
Flood! The Great Flood of 1993 leaves a wake of destruction across the Midwest. Can rivers ever be contained?
Hunt for the Supertwister Tornado-chasing scientists with an eye to better forecasting risk their lives to plumb the secrets of nature's most terrifying killer.
NOVA scienceNOW: Hurricanes Predicting a hurricane's intensity is notoriously difficult, but new tools may make it easier.