This unique historical monument features large concrete spheres designed to resemble fallen stars.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

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

The site of the deadly Triangle Shirtwaist Factory Fire.

Plot your trip through the city on the sidewalk.

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

This innocent-looking townhome is actually a subway exit.

Holding the most bodies of any cemetery in the United States.

A terrific purveyor of natural history objects and curios.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

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

A prohibition era watering hole for the police.

A small part of lower Manhattan is actually made from a bit of England.

A veritable variety of odds and ends.

These historic buildings once housed the headquarters of one of the most infamous gangs of New York.

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

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

Avoid gangster interaction while window-shopping.

This humble historic facade hides a history of boozing and the gentlemanly sport of rat-fighting.

Ride the subways of yesteryear.

This 220-year-old house is a reminder of New York City's Dutch past.

A hidden "place of interment for gentlemen."