This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

Europe's official "zero-level," the equator of elevation.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

A unique collection of gilded age mechanical pianos.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

This cheese shop also houses a museum devoted to Dutch dairy.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

A floating cat sanctuary on an Amsterdam canal.

The second largest maple syrup producer in the U.S. runs a high-tech operation.

Haunted Victorian house that inspired a legendary "Ghostbusters" court ruling.

This giant rock arrived at this quiet park thousands of years ago on the back of a massive glacier.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

Established in 1937, the oldest candy shop in New York City boasts a rainbow-colored inventory that would make Willy Wonka envious.

The oldest Methodist church in the United States has been spreading the good news for over two centuries.

The East Village tenement from the cover of Led Zeppelin’s 1975 album has a tea shop on the ground floor.

Here be dragons.

A large boulder marks the place where the island of Manhattan was purportedly "sold" to the Dutch.

Even for Egyptian royalty, the afterlife was bring-your-own-beef.

The studio of influential composer Charles Ives is perfectly reconstructed, hidden in the back of the American Academy of Arts and Letters.

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.