This "floating railway" is one of the world's oldest monorail systems.

A striking 12th-century-style castle built on the edge of a cliff.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An eerie, derelict amusement park in Berlin.

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.

Colorful and chaotic stacked hotel in North Holland.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A subterranean playground in an abandoned slate mine.

The largest greenhouse in the world is home to over one million types of plants.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

On this stunning Scottish island, you can walk in the footsteps of dinosaurs.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

Famously misunderstood wonder of the ancient world

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

These fantastically named natural pools look like something out of a Scottish myth.

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

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

This fairytale medieval church in Poland originally spent centuries in Norway.

Bohemian paradise covered in majestic forests.

Europe's largest natural bridge has a 19th century royal chateau built into its side.