The first museum in the United States dedicated entirely to posters.

Stunningly detailed mosaics in a New York subway station bring life to the Weimaraners of artist William Wegman's work—and to thousands of commutes.

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.

Even for Egyptian royalty, the afterlife was bring-your-own-beef.

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

The mysterious image is believed to show Edward Hyde, 3rd Earl of Clarendon, in a beautiful blue dress.

A controversial magical figure is hidden within a diorama of the city.

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

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

Commemorating the spot where the famous scientist fed his pigeons.

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

There must be a pun in this haystack somewhere...

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

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.

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

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

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

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

This miniature village stays behind in the Breuer Building, even as the museums around it come and go.