The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

The anatomical-pathological collection of a man who changed surgery.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

A Yiddish theater turned movie house turned rock and roll landmark turned gay disco turned bank.

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

The smallest island in Manhattan is a manmade landfill dominated by a Buddhist peace arch.

Nope, not Washington Irving's house.

The former sign of this immortal music venue is just that--undying.

A simple midtown bar was once the home of a secretive and exclusive club staffed by "bunnies" under Hefner's strict rules.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

The famous facade of Grand Central Terminal hides a regulation tennis court—and it's not the first one.

Currently housing a corporate bank branch this building at the southern tip of Manhattan was once the gateway to luxury vacationing.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.

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

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

A Manhattan office building is home to the world’s largest chess board.

Captain America, Sub-Mariner, and the Human Torch were all born in this art deco Manhattan masterpiece.

“Invented in Key West, Perfected in Brooklyn."

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.