The oldest living tree in Manhattan comes shrouded in sinister legend.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

One of the last Jazz Age "Wonder Theaters" in New York City.

From scholastic to sepulchral - now under reconstruction.

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

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

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

One of only two commuter aerial tramways in the United States.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

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

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

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

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

A crumbling hospital from the 1850s on Roosevelt Island.

You would never come across this tiny green oasis if you didn't know it existed.

A fantastical bed and breakfast with magically unique rooms.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

The highest point in Belgium is a staircase to nowhere.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.