Ready for a move? See pictures of the best and worst countries to live in according to a new report by the United Nations.

Some 217 bird species in the U.S. are at risk of extinction from habitat loss, global warming, and pollution, warns a new five-year study of bird data.

Landscape features as tiny as half the size of a basketball court can be seen on the sharpest map of the continent to date.

Glaciers, penguins, and hot springs are drawing cruise ships like the M.S. Explorer, whose sinking has sparked an environmental debate.

Activists protest Japan's whaling, a deadly mine accident roils Ukraine, fog envelopes Dubai skyscrapers, and more.

Newly released images of the sacred cave believed to have housed the infant twins Romulus and Remus show a vaulted ceiling covered in rich mosaics.

Wildlife conservationists in India have devised a humane way to prevent wild elephant attacks on settlements and crops -- building fences smeared with the world's hottest chili.

Exclusive new pictures show a 450-pound Mekong giant catfish. It's the only one caught this year—a bad sign, according to a scientist on the scene.

Pachyderm power budges a cyclone-shocked bus, a priceless map is found, CSI-style crime fighting goes to church, London burns, and more.

Rocky planets are forming—and occasionally colliding—around a nearby star, scientists say. The find suggests that Earthlike planets may be far more common than previously believed.

Vacuum, lawn mower—whatever you call it, Nigersaurus was bizarre. See a 500-tooth dinosaur whose secrets are coming to light.

The world's largest trout, overfished to near-extinction in most of its habitat, is still thriving in Mongolia's remote rivers.

The world's smallest bear and the only short-faced bear are among the 75 percent of bear species threatened with extinction, a new report says.

The temple, which includes colorful murals and an altar, dates back 4,000 years and is among the oldest sites discovered in the Americas, archaeologists say.

An eight-limbed girl, a celebration of skulls, and a monster hailstorm are among the world's most eye-opening images this week.