The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

Ride the subways of yesteryear.

A terrific purveyor of natural history objects and curios.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

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

This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day.

The world's fifth tallest waterfall is a spectacular silver chute of water that cuts through the cloud forest in northern Peru.

White llama terraces dazzle in Peru's "other Machu Picchu."

One of the world's tallest waterfalls wasn't revealed to the world at large until 2006.

Visitors dip into a variety of pools of what was once ice.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

An unexpected desert oasis in South America.

A market for witches is hidden within a train station.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

An Amazonian hotel is the ultimate treehouse and provides stilt based accommodation.

Part of one of the largest flooded cavities on the planet, and littered with prehistoric animal bones.

Macabre museum devoted to historical Viennese murders.

Each year melting snow turns these Austrian hiking trails into scuba zones.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.