Visit the site of a subway powered by nothing more than air--and lots of it.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

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

NYC's legendary underground network for bovine transportation.

A staggering collection of photographs depicting medical, social, and historical change.

Commemorating the spot where the famous scientist fed his pigeons.

Rummage through this sunken ship, but leave your scuba gear at home.

A whimsical, but often overlooked clock in Park Avenue.

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

Hear the tales of New York's most notorious criminals.

A bit of retro transportation flair preserved in the world's largest department store.

This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

Relics given to a Manhattan church to avoid seizure by the Italian government.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

The "Seinfeld" diner.

Avoid gangster interaction while window-shopping.

An artist's cute bronze subway sculptures belie his violent artistic past.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

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

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

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

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

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