This ruined folly was originally built to honor a failed American state that would have become "Westsylvania."

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

An avant-garde artist is survived by his seaside garden.

A house of bones — but nobody is quite sure to whom they belong.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

Countless grotesque faces stare out from this eerie Prague art wall.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

The remnants of a strange stilted building on rails can still be seen at low tide.

Half-drowned wooden stumps and stone blocks are all that remain of a Victorian landing that was destroyed by storms.

Decrepit Victorian public lift is a white-knuckle ride.

Try not to get slimed in Tribeca.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Surreal riveted sea forts once protected the Kent shores from German attack.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

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

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

A 20-meter (65-foot) robot towers over Tokyo Bay.

Starship-temple contains 400 tons of drinking water and offers free Japanese lessons.

A giant robo-cockroach building devours Tokyo.

Built by King Norodom to honor his late father.

9,000 years of carnal history is on display at China's original Museum of Sex.

Hidden behind musical flora and forgotten for over a thousand years, this cave is now a neon dream.

China's very own Atlantis is an ornate dynastic city resting at the bottom of a lake.