Recent discoveries paint a complex portrait of the Vikings and their boat journeys to places as far-flung as Istanbul.

NOVA examines the International Space Station, the largest construction project ever undertaken in orbit.

FRONTLINE and NOVA take on a complex and critical phenomenon—global warming.

Two teams working from opposite sides of a turbulent river attempt to build a 12th-century Chinese bridge.

An anthropologist looks for the lost city of Africa's Lemba tribe, and investigates their claim to an ancient Jewish heritage.

NOVA sets out to create a working Roman bath, complete with hot tubs and underfloor heating.

The discovery of a 9,000-year-old skeleton embroils scientists in a debate over North America's first inhabitants.

How did the ancient Easter Islanders move and erect giant stone statues? Our team tests one theory.

An elegant mathematical formula attracts Wall Street's attention and spawns a multi-trillion-dollar industry.

Experts take on the challenge of raising a 40-ton obelisk without using modern technology.

Makeshift labs in China and Russia are turning out synthetic gemstones that rival natural diamonds.

Two teams set out to build precise replicas of a fearsome medieval weapon—the trebuchet.

The program chronicles a successful 1999 NOVA expedition to investigate the mysterious disappearance of George Mallory and Andrew Irvine high on Everest in 1924. During this expedition, which included a NOVA/PBS Online Adventure, Mallory's body was found, though the mystery only deepened.

Our cinematographer films inside a hive and follows bees in flight to capture honeybee behavior.

The program tells the story of a handful of brilliant, obsessed surgeons and researchers who have pursued the target of a practical artificial heart for decades.

Buried in mud beneath the shallow waters of Matagorda Bay in Texas, lay a glorious remnant of one of the most ill-fated voyages of the Age of Discovery. After years of searching the area, nautical archaeologists doing a magnetometer survey honed in on a promising site. And on the first day of diving, they were astounded to feel the distinctive outlines of a cannon, and sense the massive size of the wreck. When the cannon was hauled from the water, their hunch was confirmed: This ship, called La Belle, belonged to the 17th Century French explorer Robert Cavelier de La Salle. NOVA follows the building of a coffer dam and subsequent complete excavation of this remarkable site. Preserved were not only armaments and trade beads, but also a wealth of organic material—the wooden hull, leather shoes, and even a skeleton—that brings the voyage to life.

Most historians agree that by enabling Allied commanders to eavesdrop on German plans, Station X shortened the war by 2 or 3 years. Its decoded messages played a vital role in defeating the U-boat menace, cutting off Rommel's supplies in North Africa, and launching the D-Day landings. Now, for the first time on television, a 2-hour NOVA Special tells the full story of Station X, drawing on vivid interviews with many of the colorful geniuses and eccentrics who attacked the Enigma. Wartime survivors recall such vivid episodes as the British capture of the German submarine U-110; one of its officers describes how he saved a book of love poems inscribed to his sweetheart but failed to destroy vital Enigma documents on board. "Decoding Nazi Secrets" also features meticulous period reenactments shot inside the original buildings at Station X, including recreations of the world's first computing devices that aided codebreakers with their breakthroughs. Station X not only helped reverse the onslaught of the Third Reich, but also laid the groundwork for the invention of the digital computer that continues to transform all our lives.

In the far north of Japan, thrust out into the north Pacific, is the remote island of Hokkaido. It's a land of towering volcanoes and steaming lakes, marshy valleys and fairy tale forests. Among this magical scenery, where summers are brief and winters are fierce, lives an extraordinary spectrum of life, found nowhere else in Japan. Here among the coastal lowlands, grizzly bears plunge into icy streams for salmon, Japanese cranes perform balletic courtship dances to one another, the rare and enormous Blakistons fish owl swoops on flying squirrels, and white-tailed eagles scan the rugged ocean cliffs for unsuspecting seabirds. HIgh on the mountains Asiatic pikas, arctic hares and Siberian chipmunks gather food, ever-watchful for the predatory sable. We think of Japan as a highly-populated, ultra modern society, and yet it remains a highly spiritual place where wildlife is treasured and carefully protected. Weaving Ainu legend with fascinating natural behavior, this film will follow the lives of Hokkaido's special creatures through the seasons, to capture the true essence and beauty of this other-worldly place.

The death of Marilyn Sheppard in 1954 is one of the most famous unsolved murders in America. The indictment of her husband, Dr. Sam Sheppard, quickly became the "Trial of the Century," then the "Re-Trial of the Century," making a celebrity out of lawyer F. Lee Bailey. Although most of the forensic evidence gathered in 1954 was ignored during Sheppard's trial, it is being re-examined with today's advanced technology. Like an intricate puzzle, the clues come together to overturn previous assumptions about the killer and point to an entirely new suspect. NOVA assembles a notable team of experts—including Barry Scheck, a well-known lawyer from the O.J. Simpson trial—and builds a precise replica of the Sheppard house, complete with the original furniture. With this unique revisiting of a vanished crime scene, NOVA investigates a horrifying and sensational milestone in forensic science.

Is time travel anything more than sci-fi fantasy? Many leading physicists now believe that time travel is not only possible in theory but are discussing how to build a time machine. Physicist Kip Thorne tells NOVA how humankind's infinitely advanced descendants might go about achieving it with "quantum wormholes" and some "exotic matter." Demonstrating that faster-than-light travel may be possible, German physicist Guenter Nimtz claims to have transmitted Mozart's 40th Symphony across his lab at 4.7 times the speed of light. Impossible, yes, but recorded by NOVA's cameras and perhaps another step on the road to reaching the future or the past. The truth about time travel is wrapped up in the detail of how our universe works and how it all began. Mind-boggling as these perspectives are, NOVA dramatizes them in a playful and visually dazzling style that will captivate viewers and sweep them along on the ultimate thrill ride.

The film explores why the famous tower of Pisa hasn't fallen over yet and investigates the many efforts taken to preserve this medieval treasure.