A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

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

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

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Giant topiary dog once played a role in a terrorist bomb plot.

An early 20th-century bullring converted into a modern shopping center.

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.

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.

Founded as a refugee camp, now a popular tourist spot.

This stucco building in North Africa was the first American-owned property on foreign soil.

The modern birthplace of Irish freedom.

Though they've since been renamed, these two streets hint at Dublin's darker days.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

This chilly Canadian hotel has a four-month lifespan due to the unusual material it's made of.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

This massive statue is the personification of Bavaria and the first colossal statue of the modern period composed of bronze.