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The world's second oldest profession? Tomb raiding. To combat the problem, American dealers and museums increasingly require a paper trail documenting a relic's ownership, but looters are just taking their business to Japan and Europe.
An archaeologist working in Guatemala launches a battle to save a site from the ravage of looters.
A biologist has attached radio collars to one of the fastest and rarest great cats in the world.
February 21, 2007 · Biologist George Schaller is the first to survey wildlife in Tibet's remote Chang Tang reserve in the winter. Schaller spoke with Alex Chadwick about some surprising findings from his 1,000-mile journey.
February 1, 2007 · A settlement once home to hundreds has been unearthed near England's Stonehenge. Archaeologists think the builders of the huge stone circle may have lived in the village. It dates to the same time period.
February 1, 2007 · Snow leopards are among the world's most endangered big cats, with only several thousand left. In Mongolia's southern Gobi desert, the snow leopard is a sign of a healthy ecosytem. But poaching remains one of the area's more lucrative businesses.
November 24, 2006 · In literature, albatrosses represent weighty, inescapable burdens. But in real life, the huge seabirds use wind energy to cruise around the planet's oceans. Photographer Frans Lanting and writer Carl Safina report from one of the world's largest albatross colonies.
October 31, 2006 · Running underneath the rolling hills of Tennessee lies a still-mysterious and remote network of caverns. Many of those caves shelter fragile ecosystems, and biologist Jerry Lewis is helping to discover and protect some of those ecosystems from man's destruction. Web Extra: Photos from Below Ground
September 30, 2006 · Mingma Norbu Sherpa was one of 24 conservationists killed in Nepal this week in a recent helicopter crash near Kathmandu. A child of the Himalayas, Sherpa, 50, was an official with the World Wildlife Fund who helped change conservation practices around the world.
September 4, 2006 · National Geographic Society Explorer-in-Residence Fay has uncovered a staggering loss: During a survey of Chad -- a country of vast spaces at the heart of Africa -- he stumbled on at least 100 dead elephants near an elephant preserve, killed for their ivory tusks. Web Extra: Photos
August 8, 2006 · The Leuser Ecosystem, one of the world's richest yet least-known forest systems, is increasingly threatened by logging and encroachment by a burgeoning population. We fly into the heart of the forest to profile the conservationists trying to keep it pristine for future generations. Web Extra: Photos, Maps
September 13, 2006 · Conservationist Bruce Beehler is pushing through a wild and previously unexplored jungle in search of a mysterious and poisonous bird native to Papua New Guinea, the pitohui. His only lead and guide is a local shaman, who uses poison from the bird in his rituals.
August 7, 2006 · Some scientists believe the orangutan -- a Malay word that translates to "man of the forest" -- may soon become extinct, wiped out by the humans it so closely resembles. We travel to the Indonesian island of Sumatra to profile competing plans to save the great ape. Web Extra: Photos, Maps
July 26, 2006 · In July of 1956, wilderness activists Olaus and Mardy Murie made an expedition to the upper Sheenjek River of Alaska's Brooks Range to inventory an untouched wilderness. Five decades later, one of their young disciples returns to find the beauty intact. Web Extra: Photos, Video, Extended Audio
July 25, 2006 · The ant photographs of Mark Moffett, a Harvard-trained ecologist, are often compared to art. He talks with Alex Chadwick about his latest article for National Geographic magazine on the hidden world of one of the most aggressive species of ant. Web Extra: Ant Photos, Transcript
John Bellezza has spent 20 years searching for evidence of lost civilizations in pre-Buddhist Tibet.
A visit to one of America's first protected places: the Selway-Bitterroot Wilderness.
