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

A way to take your secrets to someone else's grave.

This small, hidden cove is home to abandoned boats.

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

Come for the pastrami, stay for the million-dollar art.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

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

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

Thriving meadows span a rooftop in one of Brooklyn's most heavily industrialized neighborhoods.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

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

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

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

New York's oldest and possibly grandest keeper of books.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

Bowl in splendor, if you're lucky.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

Slyly buy a shake in the Parker Meridien lobby.