A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Currently housing a corporate bank branch this building at the southern tip of Manhattan was once the gateway to luxury vacationing.

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

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Salute the leader of the proletariat.

A trove of century-old litho stones from the Puck Building's printing days were discovered behind a cellar wall, and are now hanging in the store.

An accidentally hidden library containing the ephemeral history of New York.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

Outstanding taxidermy dioramas showcase the grandeur of the continent's wildlife with spooky realism.

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

The oldest surviving synagogue in New York City is now a soaring art space.

Plot your trip through the city on the sidewalk.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

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

New York's oldest magic store.

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

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

Try not to get slimed in Tribeca.

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.

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

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.