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

“And the Lord said unto Johan, build for thee an ark for the end of the world is approaching.”

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

A true Valhalla for cactus and succulent lovers.

A grassy pyramid named after a French battle.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

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

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

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

A beautiful maze marks where three countries meet.

A curious collection dedicated to human and animal anatomy and pathology.

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

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

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

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

A long-closed church turned into a saintly skate park.

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

The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

In the Netherlands, one of the world's largest private car collections can be found.

The ruins of a medieval castle that once belonged to one of the most powerful families in the Netherlands.

A dream-like maze full of strange art, surreal spaces, and fantasy landscapes to get lost in.

Take a walk in a recreation of ancient Rome.

The world's only museum devoted to the wonders of fluorescence.