A lush indoor jungle fills this bustling Madrid transportation hub.

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

Madrid's last horchata kiosk is a blue-and-white beacon of refreshment.

An exact replica of a colossal Olmec head sits atop a pyramid within a Madrid traffic circle.

A surrealist labyrinth and museum of contemporary sculptures.

Mountain where Jesus was first tempted by the Devil.

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

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

Week-long block party becomes a competition for the best decorated street.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

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

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

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

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

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

At this museum in Iceland, visitors can sample fermented Greenland shark.

This scenic Icelandic lava flow is named for a pair of Berserkers who were murdered, according to a famous Saga.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

Inside this museum, visitors venture through ghost stories entrenched in Icelandic folklore.

The summer tourists on these cliffs are thousands of seabirds.

The bright red stripes streaking across the rocks are the star feature at this Icelandic waterfall.