This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

This densely-packed cluster of buildings was saved from the wrecking ball and turned into an art community.

Air-raid tunnels hidden beneath this opulent hotel provided shelter and an escape route—and one of the world's longest slides.

Memorial to the father of the Republic of China.

Hakka-style teahouse where everybody grinds their own tea.

Waste incinerator with a restaurant on its chimney.

A 16th-century horror show built in a lovely Italian garden.

Sniff the Titan Arum's rotting flesh.

Become a prohibition rebel.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

This edible park is open to any and all foragers.

Described as "the world's most blinging pool."

A magical work of architecture where a wind turbine enables monks to levitate.

This terrifying glass bridge on the side of a mountain cracks as you step on it.

Discovered after draining a local pond, these ancient man-made caves are still a complete mystery.

China’s breathtaking futuristic library is lined floor to ceiling with fake books.

The world's first hotel built in an abandoned water-filled quarry.

Ming Dynasty necropolis raided during the Cultural Revolution.

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

Mirrored floors and arched shelves create the illusion of an infinite tunnel of books.

A canvas of crops grow from vibrant red soil in this terraced farmland.