Little Red Lighthouse under the George Washington Bridge.

In 1986, Keith Haring was arrested for painting this anti-drug mural on a Harlem handball court.

A long abandoned hospital building on the outskirts of NYC.

This pole near the infield rail at Belmont Park marks the jaw-dropping margin of Secretariat’s 1973 Belmont Stakes victory.

This 19th-century clock has been restored to help withstand the harsh environment of its seaside home.

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

The home of aviation trailblazers, in a remote corner of the big city.

Spike Lee's provocative film is officially honored right where it was made, the first time a work of art was used as a secondary street name.

Bent but not broken, this massive tree has stood in the garden for over a century.

Sniff the Titan Arum's rotting flesh.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

Love is in the air along the small street in Brooklyn.

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.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The home of the first American-born saint is one of the only curved buildings in New York.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Once considered a marvel of engineering, this 107-mile canal played an integral role in building New York City.

This haunting monument honors the victims of 9/11.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

This small and serene place for quiet reflection on Staten Island was built in China based on the gardens of the Ming Dynasty.

The highest natural point in New York City and all of the Atlantic coastal plain.

Once America's longest-manned military fort, now an abandoned hulk.