This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

Unrepaired walls from a 1920 anarchist bomb attack.

A bit of retro transportation flair preserved in the world's largest department store.

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

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

New York's oldest and possibly grandest keeper of books.

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

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

A quiet and contemplative oasis in the middle of New York's bustle and riot.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

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

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

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

Lie in a hammock where George Washington stood.

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

A popular European tradition makes its way to the states on one of America's most famous bridges.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

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

An unassuming secret door once led to a legendary watering hole.

A celebration of capitalism in Midtown.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.