These striking ruins of a castle resemble a ship's stern.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

A Spanish forest is filled with mysterious stone carvings.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

Religious dwelling in a Spanish volcano.

This haunting location was featured in the final scene of a classic spaghetti western.

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

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

An arresting arch punched straight through a mountain provides one of the most scenic spots, and challenging climbs, on the planet.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

Moorish signal station on a stratgic rocky outcrop.

An eccentric collection of antique items shares space with a prop-quality witchcraft museum.

This Denmark theme park is part family attraction, part experimental archaeology project.

Generations have refused to move this doll from its dusty resting place to preserve a castle from a watery fate.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

Four alabaster giants contemplate the tides on the shore of Denmark.

These old World War II fortifications have been transformed into an unusual equine attraction.

This quiet bird sanctuary on the Danish coast is home to something not usually found in a conservation area: hunters' cabins.

Remnants of the Nazis' occupation of Denmark linger along the sand.

Tiring of digging out the door to this church for every service, it was eventually abandoned to the sands.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

The Netherlands' first car tunnel has an unusually rectangular shape.

The world's first floating farm is staffed by one human, three robots, and 35 cows.