Extraordinary rock formations in open Peruvian fields.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A valley of unique erosion patterns lends to a view like nothing on Earth.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

Khmer Rouge's high security prison.

Intensely colorful calcite pools in Southern China.

For those with no fear of heights: a skywalk 4,700 feet up on a Chinese mountain.

This Tang Dynasty behemoth is the biggest Buddha in the world.

Snow-capped peaks, colorful waterfalls and stunning vistas on the edge of the Himalayas.

A battle between nature and architecture in the Cambodian jungle.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

On the coast of Sardinia, a once-great mining village is finding new life as a coastal resort town.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

Bell tower juts out from a village buried under a lake.

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

An abandoned Incan construction project left behind a mysterious "doorway."

A sculpture of a giant hand reaches for the stars in the middle of the Atacama desert.

The largest stone moai on Rapa Nui.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.