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

This mysterious marker puzzles pedestrians and infuriates geographers.

The gilded vestiges of a sterling department store can still be found in a Brooklyn shopping center.

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

The world’s largest collection of Tiffany glass sits in a warehouse in Queens.

This secluded ruin was once a home for exotic plants.

The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.

Long-forgotten artifacts give incredible insight into New York's most glamorous hotel.

The 28-foot granite map plots the locations of 40 theaters in New York City.

The first piece of public art dedicated to LGBT rights.

Crammed into several rooms of a Staten Island home, this museum is a vodka-soaked paean to the pleasures of drinking.

A town trapped in time - 1958 to be exact.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

New York City's only radical feminist independent bookstore.

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

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

The notorious headquarters of a corrupt political machine.

Underground vaults of a former brewery beneath Brooklyn's Crown Heights are now used to ripen cheese.

A uniquely lettered street sign marks the corner where the iconic word game was invented.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

Commemorating the spot where the famous scientist fed his pigeons.