Helped by remote sensing, an expedition searches Oman's vast al-Khali desert for the lost city of Ubar.

One of the final aeronautics challenges left in the world today does not involve the use of a plane, a rocket, or even an engine. No one has yet been able to circumnavigate the earth in a balloon. Any team attempting the feat would have to fly higher than most planes ever fly and would need a passenger capsule that could both offer protection from extreme cold and carry the proper navigation and life support equipment. Depending on the powerful jet stream to propel them, crew members would have to plot their course carefully and plan their schedule to coincide with the most advantageous winds. Even landing would be a risky venture. This program follows a team of three adventurers as they attempt to make just such a journey.

With a radically redesigned bill, the U.S. Treasury fights back against a new breed of counterfeiters.

Flights in Russia's powerful fighter jets are for sale to foreign travelers. So is the Russian Air Force still in the game?

Sharks are known as the "perfect predators," but sometimes they slip up and attack the wrong prey—people.

NOVA explores the links between our individual development and the evolution of life itself.

This program reveals some of the billions of practically invisible organisms that live on, in, and around us.

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Did the crash of continents that produced the Himalayan Mountains also trigger the Ice Age?

An in-depth and heart stopping look at the ultimate chemical reaction - the explosion. Using high speed photography and dramatic reconstruction, the film will chart the tarnished history of explosives: the terrible accidents, the scientific ingenuity and ultimately, the carnage of war and terrorism.

In a 90-minuite presentation, NOVA reveals the ancient secrets of how the pyramids were built by actually building one. A noted Egyptologist, Mark Lehner, and a professional stonemason, Roger Hopkins, join forces in the shadow of the Great Pyramid of Giza to put clever and sometimes bizarre pyramid construction theories to the test.

In a 90-minuite presentation, NOVA reveals the ancient secrets of how the pyramids were built by actually building one. A noted Egyptologist, Mark Lehner, and a professional stonemason, Roger Hopkins, join forces in the shadow of the Great Pyramid of Giza to put clever and sometimes bizarre pyramid construction theories to the test.

A distinctive feature of this stone site are the trilithons, which consist of two upright stones topped by a horizontal lintel stone. In this program, the NOVA team considers how to transport and raise the massive stones, as well as how to place the lintel stone on top. By comparing different strategies and adapting ramps, levers, and other tools that might have been available to the ancient builders, the team works to meet the challenge.

Even without such technological advances as wheels, arches, draft animals, iron tools, or a system of writing, the Inca—utilizing a tradition of shared labor—achieved a number of engineering feats. The NOVA team explores both stonework and bridge building, experimenting with dragging and fitting huge stones, and working with the people of an Andean village to create a suspension bridge made only of grass ropes.

Pharaohs who built magnificent temples to preserve their names for eternity often graced temple gates with pairs of obelisks, four-sided shafts of granite that taper gently upward until the sides meet at the top to form a pyramid shape. NOVA's team of experts attempts to build, transport, and raise a scale model obelisk using those materials available to ancient Egyptian engineers: rope, dirt, sticks, and stones.

Citizens of Rome came to the Colosseum to behold free entertainment that usually came in the form of violent war games and bloody battles between humans and animals. This structure's most impressive feature was a massive canopy that provided shade from the hot sun. In order to investigate the possible forms the roof may have taken, NOVA's team constructs models at a smaller arena in Spain.

Astronomers discover planets beyond our solar system. But is there life on them?

How do paleontologists and commercial fossil hunters know where to look for rare and priceless dinosaur bones?

Ever since World War II, physicians have struggled to find ways to treat heart failure, the biggest killer in the modern world.

The world's leading sea horse biologist journeys to Australia and the Philippines to explore the secret lives of these extraordinary fish.