This unassuming retro burger joint was billed as “diner of the future” at the 1939 World's Fair.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

A reminder to choose water over wine since 1888.

The boulder on which Alexander Hamilton laid his head as he died can still be visited on the New Jersey coast.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

While it now takes more than a dime to open an account this historic Brooklyn bank still displays the opulence of the gilded age in which it was built.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

The gilded vestiges of a sterling department store can still be found in a Brooklyn shopping center.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

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

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

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

This evocative New Jersey statue memoralizes the Polish victims of a Soviet massacre.

On the Hudson resides one of the largest clocks in the world.

A simple plaque remembers an act of WWI terrorism that obliterated an island and forever scarred the Statue of Liberty.

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

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.