Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A Hawaiian stairway to heaven—that you can't climb.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

The United States Capitol's former columns still stand.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

An Australian lake whose pink hue defies scientific explanation.

A swing to dangle you off the very edge.

An enormous, inside-out glass globe built in 1935.

The ghostly remains of an accidental sea.

A trash dump made beautiful by nature's power.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

A bizarre house filled with an astounding array of collections.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A crumbling hospital from the 1850s on Roosevelt Island.

Medicinal spa created with the discharge from a geothermal energy plant.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

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

An artsy hidden staircase leads to breathtaking views of San Francisco.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

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

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.