This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

This small, hidden cove is home to abandoned boats.

The first piece of public art dedicated to LGBT rights.

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

Need to book a room at the Hotel Pennsylvania? Just dial up 6-5000.

Take in a rare, face-to-face glimpse of Lady Liberty at this tucked away Red Hook park.

A prohibition era watering hole for the police.

The world's largest collection of materials relating to lesbian history is housed in a Brooklyn townhouse.

Underground vaults of a former brewery beneath Brooklyn's Crown Heights are now used to ripen cheese.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

Beautiful mosaics cover the first stations opened on New York City's newest subway line.

What happens here stays here – unless it affects the whole world.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

A once crucial portion of the Long Island railroad still lays abandoned, waiting to be turned into an urban park.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

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

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Unrepaired walls from a 1920 anarchist bomb attack.

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

You can still ride this 100-year-old work of art in Brooklyn's largest public park.