Fabrication workshop where the encasement for One World Trade Center's beacon was constructed.

Two monstrous warehouses. One now holds priceless works of art, the other stands abandoned and dilapidated.

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

This former Norwegian sailor's church is slowly being taken over by ramshackle robot musicians.

Try not to get slimed in Tribeca.

The studio of influential composer Charles Ives is perfectly reconstructed, hidden in the back of the American Academy of Arts and Letters.

Prove you deserve to be fed by Kenny Shopsin.

Check your calendars; you might be attending a drive-in movie or sitting next to a fashion runway.

The mummified relics of an American missionary.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

Little Red Lighthouse under the George Washington Bridge.

The Vatican of the movie industry turned into an actual church.

The first "Hall of Fame" in America was designed by legendary Gilded Age architect Stanford White for what was then the NYU uptown campus.

Red frames showcase remnants of one of New York's original subway stations.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

Historic Greenpoint theater, turned roller disco, now housing a chain pharmacy store.

The notorious headquarters of a corrupt political machine.

This former crime corner has been turned into an eclectic community center.

A Manhattan Episcopal church with an eerie underground crypt.

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

The oldest Methodist church in the United States has been spreading the good news for over two centuries.

More gold than anywhere else, ever.

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