In one of the smallest countries in the world stands an original Salvador Dalí sculpture.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

France's most famous cemetery, with some of its most curious tombs.

Climb inside an iron crystal magnified 165 billion times its normal size.

Lavish royal estate punctuated with heated greenhouses.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The cutest way to stay safe in traffic.

An icon of International Style architecture on the outskirts of Rotterdam.

This vast World War II defense line was the site of a fierce battle.

This bell tower is the only one of its kind in the Netherlands and was a symbol of prestige.

Walk through the history of a Dutch truck manufacturer, from 1928 to today.

For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.

The location of the world's first telescope demonstration.

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

The struggle of a small Dutch island against the sea.

An awe-inspiring giant blue whale jaw bone stands in the center of this Dutch island.

The 20-mile causeway that separates the Netherlands from the sea.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

Atop this former dutch railway office sits an interstellar work of art.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.