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

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

England's most notorious suicide spot.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.

These massive moving sand dunes have swallowed an entire village and are still on the run.

An underground city of salt.

The mystery of the Putim Ossuary involves a tricorn hat.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

Crosses of all shapes, sizes and colors litter the mountain, the site of a huge yearly Orthodox pilgrimage.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

This Czech military museum is home to pink tank that was once a symbol of art and political rebellion.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

An abandoned brutalist monument whose history has been lost to the ages.

"Unity, Creativity, Beauty."

An collection of Chinese propaganda posters from 1949 to 1979.

Derelict airplane bodies serve as both home and income for three Thai families.

North Korea's massive art and propaganda factory now has an official gallery space in Beijing.

A chinese farmer builds robots from scrap.

This sensational Chinese temple walks visitors through the 76 weird departments of the afterlife.