America's most famous piece of self-built architecture.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

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

A one-of-a-kind collection of a unique medium.

Elevated freight railway turned wildly successful urban park.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

Try not to get slimed in Tribeca.

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Rippling sand dunes frozen in the Arizona rock.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

World's largest collection of serial killer artwork and other macabre exhibits.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

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

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Millions of numbers carved in glass represent the tattoos forced upon victims.

A plaque marking the famous abolitionist's birthplace often overlooked by visitors to the nearby Charles Sumner House.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

The world's largest piece of copyrighted artwork.