A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

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

The home of aviation trailblazers, in a remote corner of the big city.

An unconventional space for art and science housed in a massive old warehouse.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

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

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

The iconic Manhattan corner that was once the site of the Beastie Boys' fake clothing store.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

Little Red Lighthouse under the George Washington Bridge.

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

NYC's legendary underground network for bovine transportation.

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

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

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

This enormous Hindu temple in Queens serves incredible dosas in its basement canteen.

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

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

Avoid gangster interaction while window-shopping.

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