This towering church is home to a world-famous organ and a treasure trove of medieval art.

This medieval castle was painted pink as part of a now-abandoned children's theme park.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

This large sand dune in the Netherlands is home to wind-whipped trees with "floating" roots.

Europe's official "zero-level," the equator of elevation.

This cheese shop also houses a museum devoted to Dutch dairy.

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

Amsterdam's former hotspot for public executions and dissections.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

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.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

Museum preserving torture methods from the past.

A subterranean house of worship carved right out of the bedrock.

This ancient Egyptian obelisk still bears the wounds of World War I.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

Used as an example in one of the first dictionary entries for "museum" in 1706.

A stone copper was sculpted on the wall of the Carlisle Cathedral to honor a local hero.

One part local history, 99 parts gruesome haunted house.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

The celebrated eyesore created by starry-eyed sweethearts.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.