Icelandic folklore says this giant boulder was ripped from the mountains and placed at its current location, where it became home to elves.

This mysterious marker puzzles pedestrians and infuriates geographers.

This speakeasy continues the Prohibition-era legacy of Harlem's jazzy Swing Street.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

This innocent-looking townhome is actually a subway exit.

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

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

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

New York's oldest magic store.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This suburban enclave is home to a very unique art exhibit.

Love is in the air along the small street in Brooklyn.

Brooklyn's most iconic restaurant, resurrected.

This recipe is set in stone.

At this hidden studio, the dying art of taxidermy is alive and well.

Once a popular watering hole among longshoremen and shipyard workers, this neighborhood treasure spans more than 100 years of Red Hook history.

Every animal in the torah taxidermied and crammed into a Brooklyn townhouse.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

Come for the pastrami, stay for the million-dollar art.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

The private clubhouse for the members of the Academy of Magical Arts.

Where the leftovers of love affairs can live on forever.

An elaborate, hidden model train in the Needham Town Forest.