The site of the deadly Triangle Shirtwaist Factory Fire.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

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

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

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

Unrepaired walls from a 1920 anarchist bomb attack.

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

New York City's only preserved family home from the 19th century.

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

Cryptic messages embedded in the New York City sidewalk.

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

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

Plot your trip through the city on the sidewalk.

Lie in a hammock where George Washington stood.

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

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Prove you deserve to be fed by Kenny Shopsin.

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

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

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

Slyly buy a shake in the Parker Meridien lobby.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

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

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.