One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

Two gravestones clasp hands over the religious divide.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

An amusement park on the grounds of an unused nuclear power plant, with a swing ride inside the cooling tower.

Take a walk in a recreation of ancient Rome.

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

The famous facade of Grand Central Terminal hides a regulation tennis court, and it's not the first one.

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

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

This small New York museum examines Chinese history from its origins right up to its arrival in the city.

A hands-on traveling collection of the innovative devices of yesteryear.

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

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

New York's oldest and possibly grandest keeper of books.

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

New York City's only preserved family home from the 19th century.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

The oldest surviving synagogue in New York City is now a soaring art space.

More gold than anywhere else, ever.

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

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.