Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

HBO series' stage tucked away in a Greenpoint lot is the largest theatrical set of its kind in the United States.

Final resting place of two dozen New York City harbor ships.

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

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

The notorious headquarters of a corrupt political machine.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

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

Unrepaired walls from a 1920 anarchist bomb attack.

Visit the monolithic tomb of America's most famous general.

The famous author's cottage hideaway.

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

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.

The "Seinfeld" diner.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

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

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

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

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

A terrific purveyor of natural history objects and curios.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.