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

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Stunning Roman aqueduct used for 1900 years and still standing.

This magical space partly designed by Antoni Gaudi is one of the best examples of romantic gardening in the Mediterranean.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

This semi-secret storybook hedge maze is also the oldest garden in the city.

The remains of a medieval wall discovered in the basement of a jewelry store.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

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

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

A statue of the second-tallest Dutchman in history.

Rumored to have been frequented by Vincent van Gogh, it's the only remaining genever producer in the Hague.

A miniature city, once ruled by the Queen of the Netherlands.

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

Sail in for a ’dam good slice.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

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

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

The largest flower auction house in the world.