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

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

Tucked away amidst some of the most famous addresses in the world is New York’s only fraction of a street.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

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

Peek through the gates at this oasis from the city, full of Old English charm.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

New York City's smallest piece of private property.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A semi-scholarly approach to sex.

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

Elevated freight railway turned wildly successful urban park.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

A terrific purveyor of natural history objects and curios.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

The world's only museum devoted to the wonders of fluorescence.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

The spectacular history of spectacles on display.

Cat art as far as the eye can see.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

Rotterdammers' dirty minds gave this Santa a dirty nickname and cursed it to a life of wandering.