This massive complex is made up of hundreds of smaller temples that date back to the ninth century.

Subterranean place of worship in Indonesia.

This massive chapel in the middle of the Indonesian forest is both haunting and fowl.

Hundreds of Buddhas in a re-discovered Indonesian temple.

This Javanese-Hindu temple from the 15th century is unmissable for anyone with even a passing interest in erotic art.

These broken shards of ancient ruin may hide an ancient pyramid.

Island, once a pirate hideout, now home to an abandoned resort.

A palace-fortress ruin in Indonesia complete with legends of two magical tigers, eight bathing angels, and a wish-granting cannon.

This Sumatran root bridge took almost 30 years to knit itself together.

An abandoned settlement originally established by British colonialists in the Andaman archipelago.

Built by the Portuguese colonists in the early 16th century, this fort is one of the oldest European structure in Asia.

The remains of this RAF plane and its crew were lost for decades, nearly engulfed by the Malaysian jungle.

This dangerous-looking suspension bridge may have been too unstable to remain open.

A forsaken beachfront condo abandoned after the Boxing Day Tsunami.

Six times a day a train runs right through the middle of this Thai street market, sending vendors scrambling.

An early 20th-century sanatorium, long abandoned and now being reclaimed by nature.

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

The last bastion of Roman presence north of the Alps looms over a German town.

The ruins of an abandoned crematorium haunt an eerie deserted German cemetery.

The site of Austria's biggest concentration camp now honors its victims.

A curious cave church carved into the face of a cliff.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.