Intensely colorful calcite pools in Southern China.

The most alien-looking place on Earth.

This giant Cold War satellite dish has become a symbol of Trinidad's need for sovereignty.

This "floating island" plateau sits 7,671 feet above the forest floor.

A seemingly endless landscape of pure salt stretches far across Bolivia.

Dramatic river bend surrounds a natural red-rocked pedestal.

Rippling sand dunes frozen in the Arizona rock.

Stroll through a wonderland of stupendous moss-covered trees.

A clear example of the process of erosion in action.

A remarkable geological formation resembling a forest made of stone.

Mysterious hillside with a continuously burning natural fire.

The coldest city in the world.

The villagers of the coldest inhabited place on Earth adjust to unique challenges presented by day-to-day living.

A shrine of fire worship built on top of a natural flame.

Think you have a tough job? Try carrying 200 kilos through a cloud of sulfur down the side of a volcano.

A fiery crater has been burning in the Karakum Desert since 1971.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

The Dalai Lama named this New Zealand landscape the "Spiritual Center of the Universe."

Most-visited and most-photographed slot canyon in the American Southwest.

Queen of the waterlilies, so big and strong it can support the weight of a human.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

A stunning silver lining to global warming's gloomy cloud.

Some of the world's only freshwater seals live in one very special lake in Russia.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.