Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

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

The tallest waterfall in the Netherlands is a lovely, stepped feature that is only 50 feet tall.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

This giant radio telescope would be a rusting ruin if it hadn't become such a beloved relic.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.

Pull up and have a drink at a museum filled with hundreds of years worth of shipwreck artifacts.

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.

Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

This miniature take on the Kremlin is one Dutch man's retirement project.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

The giant scales in this museum can still tell if someone is one of the devil's brides just by weight.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

The nerve center of a massive, state-of-the art radio telescope that sprawls across Western Europe.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

This artificial ring island was built to hold cubic tons of polluted dirt.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

The birthplace of most all of Europe's space missions is here on the Dutch coast.

A monument hidden in the woods built in 1938 as a getaway for a Dutch museum curator.

This imposing tower named after the mythical sword of King Arthur is considered the tallest freestanding climbing wall in the world.