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.
Mystery of the Megaflood What unleashed a catastrophic flood that scarred thousands of square miles in the American Northwest?
Mystery of the Megavolcano Researchers from Indonesia to Greenland unearth clues to the greatest volcanic eruption of the last 100,000 years.
Sinking the Supership The tragic WWII story of the Yamato, the largest battleship ever built.
Storm That Drowned a City Experts and eyewitnesses reconstruct the devastating floods that Hurricane Katrina unleashed on New Orleans.
Supersonic Dream Engineers, pilots, and others who knew Concorde tell its remarkable story.
The Spy Factory Examine the high-tech eavesdropping carried out by the National Security Agency and the pitfalls of surveillance in an age of terrorism.
Tracking El Niño Scientists struggle to understand the El Niño phenomenon, second only to the seasons in its effect on global weather.
Volcano's Deadly Warning A man obsessed with understanding volcanoes comes up with a radical new way to predict eruptions.
Volcano Under the City A restless mountain threatens a bustling metropolis perched on its flanks.
Wave That Shook the World Experts reconstruct the 2004 Indian Ocean tsunami in an effort to prepare for the next big one.