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

This nostalgic blast from the grooming past is also a working barbershop.

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

Walk over a 150 year old manhole.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

An aptly-named street near the birthplace of the modern LGBT rights movement.

A touching tribute to the "Queen of Soul."

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.

The East Village tenement from the cover of Led Zeppelin’s 1975 album has a tea shop on the ground floor.

Fake subway tiles were installed to cover a design that resembled the Confederate flag—it's unclear if the resemblance was intentional.

The home of one of America's most beloved fictional characters has become a real world landmark.

The place where Dvořák composed some of his most famous works.

Nope, not Washington Irving's house.

Where the legendary Orson Welles got his theatrical start before "Citizen Kane."

Here be dragons.

The studio of influential composer Charles Ives is perfectly reconstructed, hidden in the back of the American Academy of Arts and Letters.

New York's southernmost subway station is whimsically wavy.

This vacant church in the Financial District was once the heart of New York's first Syrian immigrant community.

This nearly invisible wire transforms much of the city into one big, symbolic home on the holy day.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

The greatest real estate coup of all time.