Built hundreds of years ago this downtown iron barrier once protected a much despised king.

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

The notorious headquarters of a corrupt political machine.

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

Unrepaired walls from a 1920 anarchist bomb attack.

The oldest living tree in Manhattan comes shrouded in sinister legend.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

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

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A dilapidated dock tells the story of Titanic's missed arrival.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

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

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