A young woman's senseless murder led to the controversial psychological theory of the "bystander effect."

Ever wanted the laymen's version of your credit card fine print?

The oldest Dutch colonial stone house in New York City is a hidden gem on the border of Brooklyn and Queens.

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

Spiral-bound community recipes and antiquarian gems mingle at this small East Village shop.

The Underground Railroad passed right through this historic Brooklyn Heights church.

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

Con Edison’s exotic and heat-loving pests.

Chefs from Tibet's Kham region offer steaming meat pies and noodle soups in this nook behind a jewelry store.

Final resting place for the Triangle Shirtwaist fire’s unidentified victims.

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

Failed state-supported institution meant to rehabilitate students with intellectual disabilities.

This giant boulder is sandwiched between apartment complexes in upper Manhattan.

Risk arrest while partying to fund art.

This seemingly unremarkable boulder is said to bear the hoofprint of the devil himself.

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

Revolutionary War casualties fill the only 17th century structure remaining in Manhattan.

A hidden bar inside an ad agency has a deliberately misleading name, so employees can stay late under pretext of paperwork.

This Manhattan museum houses one of the largest collections of Spanish art and manuscripts outside of Spain.

You must take the A train... to the last active cemetery in Manhattan.

Hidden inside one of the world's most well-visited zoos is a secret plaque promising eternal life.

Collect holy water from a Bronx grotto.

A strangely angled West Village home is the only monument to an explosion that took the lives of three American revolutionaries.

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