A kaleidoscopic warehouse-maze of handmade neon signs.

Banksy gives themself artistic license with this piece of London street art.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A statue of the second-tallest Dutchman in history.

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

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

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.”

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

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

This historical Netherlands fortress still bears the marks of its single siege.

Two gravestones clasp hands over the religious divide.

Incredible labyrinth of man made caves.

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.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

The history and future of cannabis.

Peek through a transparent pyramid and drink in the mountain made of books.

This modern arts center is built around a gem of late-Baroque architecture.

This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

Christ's blood preserved in a Belgian town.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."