This semi-hidden Manhattan restaurant is based out of a loading dock.

During the holidays, a vintage subway train whisks New Yorkers back in time.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

The loneliest island in New York.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

A popular European tradition makes its way to the states on one of America's most famous bridges.

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.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

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

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

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

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

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

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

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

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

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

A psychedelic labyrinth on the San Francisco bay.