The sign at the garden gate reads: "These Plants Can Kill."

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

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

A trading post in the North Pole where children send letters.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

This former Masonic hall has been turned into an art project that uses even more metaphysical iconography.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Cryptic messages embedded in the New York City sidewalk.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

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

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Slyly buy a shake in the Parker Meridien lobby.

From scholastic to sepulchral - now under reconstruction.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

Spies, love letters, and ghost stories have all left their mark on this home-cum-museum.

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

A formerly abandoned mental institute, now back in business.

Enjoy an overnight at an old haunted B&B site of the Borden family murders.

The final resting place of New England's last "vampire."

A mysterious air force base built to resemble a Long Island fishing village.

A tiny islet just off Long Island offers a wealth of infectious curiosities.

Want to build a wind turbine? Secede from the nation.

This small-town pizzeria won the Hollywood lottery.