A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

Theme park featuring miniature replicas of European monuments.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

Meet the bronze beloved pet to a family of famous peeing statues.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Lavish royal estate punctuated with heated greenhouses.

A slightly surreal menagerie of structures that were lovingly spared from demolition and reconstructed in a field.

The world's smallest commercial theater is set up in what was once a urinal for Victorian men.

The tallest mountain in mainland Netherlands isn't actually very tall.

A giant floating rubber duck-bunny painted with a different design every year.

The world's longest wildlife overpass provides Hilversum's critters with a safe alternative to trying their luck on the roadway.

The place where houses are born.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

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

A grassy pyramid named after a French battle.

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

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

Horsemen once used this tilting post during jousting practice.

The "Heroine of Dunkirk" rescued over 7,000 Allied troops during the historic World War II evacuation.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

In 2013, historians discovered a hidden room devoted to the art of making royals' hot chocolate.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.