This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

An elevator into the Baltic Sea.

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.

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

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

This small New York museum examines Chinese history from its origins right up to its arrival in the city.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

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

A hands-on traveling collection of the innovative devices of yesteryear.

This former crime corner has been turned into an eclectic community center.

A partially hidden wall graffitied by spectators of the 1976 Bicentennial, recently rediscovered.

Check your calendars; you might be attending a drive-in movie or sitting next to a fashion runway.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

The "Seinfeld" diner.

A notorious punk house turned co-op.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

One of the last Jazz Age "Wonder Theaters" in New York City.

A posh members-only club with a literally dramatic history.

Phil Mortillaro uses keys to bring art back to the Village.

NYC's legendary underground network for bovine transportation.

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

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

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

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