The mummified relics of an American missionary.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

Walk into the 19th century without leaving Brooklyn.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

A Manhattan Episcopal church with an eerie underground crypt.

An oasis of calm amid the chaos of the boardwalk, the museum traces the heritage of this beloved beachside amusement park.

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.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

A staggering collection of photographs depicting medical, social, and historical change.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

Relics given to a Manhattan church to avoid seizure by the Italian government.

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

A good place to research the Freemasons, esoterica, occultism, and hermeticism.

A whimsical, but often overlooked clock in Park Avenue.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

Volunteer-run library dedicated to exploring five decades of activism history.

This innocent-looking townhome is actually a subway exit.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

Unrepaired walls from a 1920 anarchist bomb attack.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

The former hotel where Tesla invented the radio.

The factory for the popular Dumbo location, the Greenpoint shop is a quiet gem.