Three bridges and one giant canyon make up this fantastic Spanish settlement.

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

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A 16th-century Andalusian palace.

The world's largest wooden structure.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

A whimsical bridge uses saxophones to pay tribute to two great men and the European Union.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

Amsterdam's former hotspot for public executions and dissections.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

A beautifully eclectic mix of architectural styles.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

A giant bug impaled on a 75-foot-tall needle.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

The Belgian library displays burned books that were salvaged from the fires of both world wars.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.