What was once a unique system of urban elevators is turning into a mechanical ruin.

Nondescript elevator doors open to reveal a stunning, surreal world.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

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

Lie in a hammock where George Washington stood.

Ride the subways of yesteryear.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

The house that took a plunge into the facade of a museum.

Three-story slide through the New Museum.

Walk over a 150 year old manhole.

Plot your trip through the city on the sidewalk.

Reverend Jen's unique museum/living room showcases her troll collection.

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

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

Covered in tens of thousands of coats of paint, this Indiana attraction holds a world record all its own.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

The seat of Buffalo government is a gorgeous Art Deco palace.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

A stately palace has been converted into the world's largest cannabis museum.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

This subterranean disco dance club in a Cuban cave comes with bright lights and a dark legend.

One of the world's few mounted blue whales, its jaws are hinged open allowing visitors to descend into a lounge.