The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

Kissing the ass of this stone lioness has become a rite of passage in the city of Girona.

This lucky bronze frog was gifted to Madrid by a casino.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

Mountain where Jesus was first tempted by the Devil.

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

This enormous censer uses a pulley system installed over 400 years ago.

Elaborate tile work in this railway station tells the story of Portugal.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

Yo, Adrian!

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Of course Salvador Dalí lived in a castle...

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

A lush indoor jungle fills this bustling Madrid transportation hub.

Hang out with thousands of butterflies in one of the world's largest such enclosures.

Climb to the top of the world's largest seated bronze Buddha.

Not quite the menace it once was, this monster still has some chops.

A quiet patch of astroturf laid out between a building that seems to be splitting in half.