Lake Kivu contains enough carbon dioxide and methane in its depths to kill all two million people who live in the lake basin. Above it is Mount Nyiragongo, the volcano which threatens the area.
Carved between San Francisco and Los Angeles, the magic of the 'Big South' stretches just 145 km long and 32 km wide, but nowhere else in the world does such a wide variety of extreme habitats exist in such close proximity to one another.
Follow U.S. President Barack Obama's official photographer, Pete Souza, as he captures the President in key political and social situations.
Examines a provocative new theory that viruses played a role in the diversification of life and evolution.
Four remarkable animal movements from around the world, including the sperm whale, red crab and monarch butterflies.
Spanning 6 million acres of wilderness, located just 200 miles from the Arctic Circle, Alaska's Denali National Park is home to Mount McKinley, the tallest mountain in North America.
The southern cassowary struggles to survive following a cyclone that destroyed their home in 2006.
Photographer Carsten Peter rappels inside volcanic craters on the South Pacific island of Ambrym.
Searching for the location where the HMAS Sydney sunk off the coast of West Australia in 1941.
Moving elephants to their Malaysian rainforest habitat to protect them from locals.
The lives of cheetahs in the Serengeti, the fastest but most vulnerable of the big cats.
Searching for seeds that may help prevent a global food shortage brought about by climate change.
Tracking hammerhead sharks in order to aid their survival and link a network of shark highways.
The promise of oil beneath the surface makes the Arctic National Wildlife Refuge a treasure.
A humpback whale and her calf journey from Hawaii to Alaska and back.
A campaign to protect the largest system of national parks in the world.
The San Francisco quake of 1906.
Exploring the numerous kinds of parrots and cockatoos found in Australia.
Modern law-enforcement groups combat tomb raiding with high-tech equipment.
Forensic and other experts try to identify the crew of the CSS Hunley, sunk during the Civil War off the coast of South Carolina.
When the Amazon's dry season begins, thousand of black caiman (a cousin of the crocodile) move to the only source of water remaining, the lake.
A look at the jellyfish, which has survived more than 500 million years despite no bones, blood or brain.
An inside look at some of the holiest and most contested sites in Jerusalem.
High tech equipment is used to explore their hidden lives.
Scientists, beekeepers and exterminators work together to stop invading swarms of killer bees.
Researchers seek to learn why the Mayan Empire collapsed.
High-tech tools help protect grizzly bears deep in Alaska.
The American bison is skilled at surviving.
Hurricane Katrina causes disaster in New Orleans in August 2005.
Mythical giant serpents; their danger to humans.
In some places, humans are still guests and nature rules.
Large, powerful cats look at humans in a new way.
Tim Samaras has dedicated his life to chasing down tornados.
In a lion park in South Africa, a zoologist raises some of the world's most dangerous animals.
Wild bonnet macaques thrive in the cities of southern India.
Dr. Jesús Rivas studies constrictor snakes.
An underwater journey enters the strange world of rarely seen creatures.
Mark Deeble and Victoria Stone capture on film some of nature's most elusive creatures.
The Hawaiian monk seal is an ancient species on the brink of extinction.
An expanse of pristine wilderness lies in the heart of South America.
Belize's coastal reefs attract sea creatures such as the whale shark.
Only the most determined survive in last stretches of North American wilderness.
Sheer size has made the Mayan city of Teotihuacan difficult to excavate.
The giant ibex survives among predators and frightening cliffs.
The Namib is one of the world's oldest deserts.
The institution of monarchies and their relevance in a democratic world.
Exploring Tepui mountains in the highlands of Guyana and Venezuela.
Researchers discover the bones of miniature humans on an island.
Scientists from around the world investigate King Tut's curse.
The sunken steamship SS Republic is reputed to hold a fortune in gold coins.
Two modern day stories of exploration and discovery as a new Afghanistan is built.
Six kinds of lemurs live in the caverns of Tsingy Stone Forest.
The effects of global warming on Antarctic emperor penguins.
Meteorologist Josh Wurman tries to discover why some structures are demolished by hurricanes while others are untouched.
A devastating plague of locusts in North America.
Development in India turns otherwise-docile elephants into rampaging herds.
Archaeologists unravel fascinating mysteries surrounding the fabled city of Troy.
Exceptional test-pilots take various aircraft through their paces.
Some of the fastest animals on the planet.
Sixty years after the first ascent of Mount Everest, sons of the original expedition members attempt the climb by two different routes.
How the jaw has evolved as a tool for predators of all sorts.
Strategies and techniques of animals who coordinate for the kill.
A behind-the-scenes look at ten memorable shots by National Geographic photographers.
The crittercam allows researchers to see the world through their subjects' eyes.
During war in the Falklands in 1982, a British submarine sinks the ARA General Belgrano warship.
The Bactrian hoard contains more than 20,000 pieces of gold jewelry and ornaments; an archaeologist searches for a third Buddha statue buried in Bamiyan, Afghanistan.
Fulani herders spend up to eight months away from home tending their cattle.
A robot searches the depths of the Great Pyramid of Pharaoh Khufu; archaeologists find what may be the oldest mummy in Egypt.
Spiders focus on their predatory and mating skills.
Tasmanian devils have selective breeding and reproduction methods that enhance the possibility of the survival of their young.
Government operatives tap into a 3000-mile-long communications cable slung across the Atlantic seabed.
A Pakistan women successfully prosecuted her husband.
Follow the efforts of the mountain rangers of Mount McKinley.
Arlington National Cemetery in Virginia contains the graves of people who were in the U.S. military.
Scientists try to protect the Great Bear Rainforest in Canada.
Scientists explore the seafaring Phoenicians and their culture.
Examination of the lives and environment of many animal species as well as the evolution of humanity.
Archaeologists discover a Mayan mural and temple carvings.
The predator who has outlived the dinosaurs may outlive humans.
Cameraman Bob Cranston studies sharks in an effort to understand why they have begun to congregate in shallow waters closer to people.
John and Jason Lever run a crocodile farm in Australia.
In search of the deadliest swarms on the planet.
Scientists explore the connection people have with whales.
Photographers go the extra mile to get that perfect shot of big game cats.
African wildlife collides with a booming human population as each compete for space and survival.
The devastating effects of the Ebola virus on small villages in the Congo.
Biologist and scientist search for the highly endangered Orinoco crocodile, in an effort to introduce them back into the wild.
An exploration of the lives of jaguars.
The stories of three soldiers depict U.S. Special Operations.
The saluki walk and hunt alongside their Bedouin masters in the Arabian desert.
Scientists work to preserve the lowland gorillas.
Scientists follow the migration patterns of Humboldt squid, ravenous predators of the Sea of Cortez.
Conservationists reintroduce wolves to Yellowstone Park.
Elephants aid the logging industry in Burma.
Killer whales use the marine sanctuary of Monterey Bay, Calif., as a hunting ground.
The lives of cheetahs and their prey in the Kgaligadi Transfrontier National Park.
Dominic Cunningham-Reid documents the devastating consequences of a civil war fueled by the black-marketing of diamonds and shows the horrors of those caught in the trade.
Rom Whitaker visits Costa Rica, one of the snakiest places on earth.
Herpetologist Rom Whitaker travels around the country observing both venomous and benign snakes.
All three monotheistic faiths have adherents in Ethiopia; some claim the Ark of the Covenant is there.
Logging threatens the traditional lifestyles of forest-dwelling peoples.
A boy from Niger joins his father's caravan for a journey across the Sahara.
A young male leopard struggles to reach maturity.
The lifestyle and culture of Brazilian Pantanal cowboys.
French archaeologist Alain Zivie excavates tombs at Saqqara, city of the dead, near Egypt's first pyramid.
Unprecedented access to more than a dozen U.S. diplomats reveals the skills and efforts that support stability in America's relations with foreign states; Secretary Colin Powell is among those interviewed.
A modern scientist creates a mummy using techniques of the ancient Egyptians.
Tracing the rise and fall of the Incas gives new insight into the civilization.
Humankind's struggle with the infectious diseases of the past and present.
Two researchers spend two weeks on top of a live volcano.
The experiences of people who have survived near-death encounters with deadly toxins.
Owls display unrivaled skills as a predator and an ability to adapt to almost every corner of the planet.
Nature filmmakers Mark Deeble and Victoria Stone's two year study of a family of hippopotamuses.
Paul Tidwell searches for the treasure of a sunken World War II Japanese submarine.
Snakes' relationship with humans.
The life of a walrus.
Raising orphaned bear cubs.
The evolution of raptors.
Scientists search for the Loch Ness monster in Scotland.
Ecologist J. Michael Fay travels to the Congo to survey an entire forest ecosystem.
Salvage teams search for American and Japanese aircraft sunk at the Battle of Midway.
An elephant and her herd of 18 travel in Namibia.
Great Rift Valley, Kenya; Lake Bogoria.
Habits and survival tactics of raptor Johnny Rook.
Oceanographer Robert Ballard leads an expedition to the Black Sea in search of artifacts that would support the biblical story of a great flood.
The life of the sockeye salmon.
India's bonnet macaque.
Gary Nagal and Ted Bell fly vintage DC-6s at speeds greater than 125 mph.
Photographer Gordon Wiltsie and writer Jon Krakauer scale the Holtedahl and Drygalski mountains of Antarctica.
A journey across the Sahara.
The life of a monitor lizard, from birth to adulthood.
A family of foxes struggles to survive in the desert.
The guanaco, a wild Andean llama, is tough, aggressive and always alert for pumas.
Walruses struggle for survival.
Elephants in captivity develop ties with their handlers.
African crowned eagles nurture their chicks.
The giant bluefin tuna.
'Jaws' author Peter Benchley researches white sharks.
NFL Films cinematic approach to football game coverage.
Dian Fossey spends more than 10 years studying reclusive mountain gorillas in African rain forests.
The White House staff.
The African landscape features a variety of venomous snakes.
Various animals change their appearances or transform in order to survive.
The lives of India's honeybees.
Tiger sharks off the coast of Hawaii.
Possible causes of the Hindenburg tragedy.
Bloodthirsty birds evolve in the Galapagos Islands.
The golden jackal in Tanzania.
Conservationists return wolves to Yellowstone National Park after a 50-year absence.
Parasites; mites; fleas; tapeworms.
Inventor Graham Hawkes explores the ocean with a deep-sea submersible.
Volcanoes pose a threat to nearby citizens.
Filmmakers track an endangered Bengal tiger for two years, capturing her struggle to raise her cubs and survive in the Kanha Preserve; narrator Linda Hunt.
Bob Billard explores the ocean floor for artifacts from ancient shipwrecks.
Forest creatures feed along the shores of Kenya at low tide, and sea creatures feed at high tide.
Wildlife filmmakers demonstrate how they capture unforgettable images.
Kelp supports many species off California's Channel Islands.
Fishermen on Mexico's Sea of Cortez fear the giant squid.
Cats evolve from wild hunters to domestic pets.
Dolphins in the wild display graceful movement and ferocious cunning.
Mankind's use of horses changes the world.
Poachers risk death to slaughter Africa's black rhino and sell its horn via the black market in the Far East.
Jesus Rivas studies the lifestyle of the anaconda.
Land iguanas migrate up steep volcanoes to lay their eggs in the steaming caldera.
Ecological history of Newfoundland.
Rain forests may provide resources for potential miracle-drugs.
A volcanic eruption on Montserrat in 1995 buries the island in dust, forcing residents to evacuate.
Red kangaroos of Australia.
A man films pumas in the wild.
People race to save animal species from extinction.
Despite numerous fatal attacks on humans, a man attempts to save the endangered wolf of India.
Young alligators and crocodiles face challenges in the Everglades.
Leslie Nielsen explores the secret life of animals found in the garden.
Human populations encroach on the tiger's territory.
Wild dogs of the Kalahari Desert.
Umbrella thorn trees dominate the Serengeti Plains.
Arctic creatures of Svalbard.
Amazing underwater creatures inhabit Monterey Bay Canyon.
Desert in the American Southwest.
Sunken Swedish warship; dolphin talk; restoring Da Vinci's 'The Last Supper.'
Lynn Rogers and Greg Wilker study black bears; Stone Age tribe on New Guinea.
The venomous king cobra of India.
Astrogeologist Eugene Shoemaker discusses the impact of asteroids on Earth.
Scientists research cyclones to minimize their impact.
Researchers study the hunting strategies and communication of killer whales.
Flood waters nourish the diverse wildlife of Botswana's Okavango delta.
Marine explorer Robert Ballard investigates the 1915 sinking of the Lusitania.
Robert Ballard searches for wreckage of the Titanic; narrator Martin Sheen.
Robert Ballard leads an expedition to find a sunken German battleship.
Rain forests and wildlife of Barro Colorado Island.
Researchers explore the journey of the loggerhead turtle.
Mike Novacek and Mark Norell search for dinosaur fossils in the Gobi Desert.
Animation and time-lapse photography explore the rhythms and cycles that control life.
Photographers discuss the different aspects of their jobs.
Sharks rarely live up to their reputation as killing machines.
Filmmakers David and Carol Hughes document wildlife's struggle to find water for survival in South Africa.
Norman Vaughan, in his 80s, climbs the Antarctic mountain named for him years before.
Similarities between the leopard and the warthog.
Filmmakers follow the development/socialization of a panda cub of eastern China.
Pollution and dams threaten the river.
Hang-glider pilot Judy Leden and balloonist Per Lindstrand train for a world's record.
Survivors of the World War II battle of Guadalcanal return to the scene.
For three years, Derek and Beverly Joubert chronicle a trio of male lions.
Rodney Fox, victim of a shark attack, champions sharks.
Six months of darkness and six of light on the Arctic ice edge.
Coyotes in Yellowstone National Park.
The army fights poachers in Botswana.
The story of Czar Nicholas II.
Wildlife of the Atlantic barrier islands and salt marshes.
A recreation of the 1919 record-breaking flight from England to Australia.
African vultures illustrate nature's efficiency.
Chimps exhibit traits once thought to be exclusive to humans.
Pilot Tom Claytor conducts an air tour of Africa.
Filmmakers Derek and Beverly Joubert follow the migration of zebra herds in Africa.
Howard Hall films undersea life off the Caymans, the Bahamas, St. Croix, Dominica and Belize.
A profile of African elephant society focuses on behavioral patterns.
Man's presence on Kodiak Island in the Gulf of Alaska threatens Kodiak bears.
Chronicle of a year in the life of a group of wild kangaroos.
Visits to the Florida Everglades, Love Canal and the Ogallala Aquifer reveal countrywide water issues.
For nine years Jen and Des Bartlett track and film Namibia's desert wildlife.
Dedicated people spend their lives ensuring the survival of endangered creatures, from rhinos to orangutans.
Mayan descendants, city ruins, rituals and scholars show the culture's heyday, present and future.
Cavers explore Lechuguilla; other caves feature waterfalls, underwater mazes, icefalls and odd creatures.
Men strive to save endangered whooping cranes during their 2500-mile migratory flight from Texas to Canada.
A 30th-anniversary tribute recalls Edmund Hillary's historic climb of Mount Everest.
Emmy-winning documentary shows Dr. Jane Goodall's pioneering research of chimpanzees of Tanzania's Gombe Stream National Park.
Moist fog from the sea helps sustain unusual wildlife inhabiting the Namib Desert's harsh environment.
A study of earthquakes, volcanoes and geothermal energy helps to illustrate the theory of plate tectonics.
Scientists study and try to breed giant pandas in China's remote Wolong Natural Reserve.
Australia's wildlife, much of it unique, includes kangaroos, koalas, flying possums and platypuses.
An Emmy Award-winning exploration of Costa Rica's forests focuses on deforestation's effect on animal species.
The Philippines' Mindanao tribesmen struggle to preserve their ancient culture.
A scenic film follows the course of the historic Thames River past peaceful countryside and London's monumental structures.
Churchill, Manitoba, prepares for the annual polar-bear migration into the community.
Archaeological research methods help preserve and decipher the legacy of the Egyptian pharaohs.
Sharks live, breed, attack and defend themselves; man auctions tons of shark carcasses each day for food and jewelry.
Groups from the United States, Italy, France and Japan attempt to climb Godwin Austen, the second-highest mountain.
A recent decline in the gorilla population is studied.
National Park Service rules restrict public access to tax-supported vacationlands.
Japan honors its artisans and performing artists, who preserve culture in a rapidly changing environment.
Wildlife in Namibia's Etosha preserve gives evidence of complex life/death relationships.
Advanced microphotography reveals internal workings of human organs, including the heart and lungs.
A nostalgic voyage aboard the Queen Elizabeth 2 recalls the heyday of great ocean liners.
Sophisticated equipment records what humans cannot see: uranium atoms, a bullet in flight and pictures of a developing fetus.
A diving expedition records information gathered 1.5 miles below the surface of the Pacific Ocean.
An Emmy Award-winning 1978 report reviews whaling history and efforts to halt its slaughter.
The disappearance and reappearance of an African river complicates life for local fauna.
Labors of the dam-building beaver affect land and wildlife around ponds.
Four free-spirited adventurers trek through the Yukon wilderness.
Camera techniques reveal the beauty, complexity and social behavior of the world's insects.
American Indians struggle to maintain their heritage while adapting to the modern world.
Norsemen keep alive the centuries-old traditions of their Viking ancestors.
Animals in Namibia's Etosha National Park are tracked for a year.
A centuries-old tradition of battling the sea has left England with the rich heritage of an island empire.
Scientists Dian Fossey and Birute Galdikas-Brindamour explore the mysteries of the great apes.
The defenders and destroyers of the West's 'varmints,' such as mustangs, coyotes and rattlesnakes.
Poaching and the encroachment of civilization decimate Kenya's elephant population.
Scientific research reveals the complexity of the human brain.
Legends of the American West color the lives of cowboys, miners, Yaqui Indians and desert townspeople.
Revered as gods, as spirit messengers and as symbols, birds have long fascinated mankind.
A study of the celebrated metal gold includes visits to mines, markets, jewelry factories, smugglers' dens and art museums.
A Volga River journey shows the varied cultures along the way.
Explorer Thor Heyerdahl and crew sail Tigris, a bardi-reed craft, from Iraq to trace possible routes of ancient Sumerians.
Hawaiian mariners set out to retrace an ancient route to Tahiti aboard the Hokule'a, a 60-foot, double-hulled sailing canoe.
Mel Fisher and his treasure-seekers dive off the Florida Keys to find the wrecked Spanish galleon Nuestra Senora de Atocha.
The Leong merchant family of Hong Kong typifies daily life in the British island colony.
Young people in an Outward Bound School in Colorado prepare to climb a Peruvian peak.
Encroaching ranchers force changes to traditional African lifestyles.
Anthropologist Louis S.B. Leakey studies human evolution in East Africa.
Adventurers cross the Sahara in land yachts.
Families in the Alaskan bush cope with extreme weather, medical emergencies and other hardships.
Mexican philosophers, artists, citizens, historians and aristocracy describe their country.
A natural rivalry exists between hyenas and lions, shown giving birth and raising young.
Conservationists try to prevent extinction of Hawaii's native flora and fauna.
Wild baby geese take in nature photographer Dan Gibson as a member of their family.
Tradition and technology merge in modern Spain; narrator Richard Kiley.
The Great Lakes sustain millions of creatures and offer man livelihood and recreation.
Through the ages, people regard the domestic cat with both admiration and loathing.
Two families raft on the Potomac, Hudson and Salmon rivers, observing the destruction of fragile environments.
A portrait of elegant Leningrad shows a city in cultural, economic and political transition.
Predators and prey play out life-and-death dramas on the African plains.
Amazonian creatures adapt to extreme seasonal fluctuations in water levels.
Geologist Haroun Tazieff studies eruptions and lava flows on Sicily's Mount Etna and an African volcano.
Wildlife photographer Hugo van Lawick captures the environs and people of Tanzania's Serengeti National Park.
Man employs the canine in hunting, war, sports, herding, rescue and as aids for the handicapped.
Poaching threatens survival of the pachyderm employed worldwide for labor, amusement, profit and worship.
The primitive Baka Pygmies depend on the forest for clothing, food, shelter and medicine.
Nocturnal creatures: owls, hyenas and bats, who use a form of sonar to navigate.
Searching around the world and back millions of years provides clues to the origins of the human race.
Highlights of performances showcase four great circuses in Moscow, Minsk, Voroshilovgrad and Ashkhabad.
Documentary recalls the iron horse's golden age and shows modern railroads.
The Gagudju, a fading Aborigine culture, lives its final days in northern Australia.
Profiling the monarchies that still exist in four different countries; the relevance of monarchies that once ruled the world.
Mark and Delia Owens research lions and brown hyenas and note dangers facing wildebeests in Botswana.
The life cycles of chameleons, newts, rattlesnakes and dinosaurs.
Craftsmen restore Leningrad palaces, a turn-of-the-century carousel, an ancient ship and a Duesenberg.
The history of the Vatican reveals an institution with complex layers; narrator Martin Sheen.
Scientists study endangered grizzlies from desolate Alaska to tourist-packed Yellowstone.
Archaeologists excavate Herculaneum and Pompeii, buried by Mount Vesuvius' eruption in 79 A.D.
Producers Carol and David Hughes follow a pride of 40 lions through a typical jungle night.
The rites and rituals of Muslims' pilgrimage to the Saudi Arabian city of Mecca.
Scientists study Japanese macaques and African baboons to isolate human behavior.
The deadly effects of the tsunami.
Alligators dominate other wildlife and vegetation in the Okefenokee Swamp.
The vast rail system of India.
A one-square-mile area of Jerusalem is the fountainhead of three monotheistic religions.
The history and methods of the Federal Bureau of Investigation.
The microscopic universe within the human body.
A tiny coastal island and its tidal forest are part of Borneo's interior rain forest.
The science of Outer Space.
Views of Chesapeake Bay and its people include watermen, ecologists and the Miss Crustacean Beauty Pageant.
A large, violent storm sweeps across the Eastern seaboard.
Adventurers search for gold and silver coins from the sunken SS Republic.
Gem/jewelry collections: Faberge eggs, Tiffany designs, England's crown jewels; how gems are mined, cut and sold.
A Masai warrior returns to Tanzania's Serengeti National Park as a ranger to study and protect its wildlife.
A report on skin's regeneration and healing processes combines with a look at the organ's cultural, racial and emotional complexities.
Use of high-tech robots and computers illustrate a partnership between man and technology.
Sturdy ponies and elegant Thoroughbreds affect the lives, history and culture of Ireland. Music by the Chieftains.
Balinese music, dance, art, festivals and rituals reflect the culture's religious beliefs.
In the Sahara Desert, paleontologists examine the remains of a 10-ton crocodilian creature.
The latest 4-D imaging systems permit an exploration of a living body, inside and out.
The lives of four Americans in China: an exchange student, a journalist, a businessman and a teacher.
Richard Kiley narrates a two-year study of tigers in India's national parks.
Air Force One transports the president and staff across the world.
First-hand accounts and film clips capture the fury of avalanches.
Portuguese fishermen sail the stormy North Atlantic for six months in search of migrating cod.
Jaguars and Asiatic lions struggle against capture, while Siberian tiger cubs get loving care in a Polish zoo.