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

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

Commonly acknowledged as the only public monument to the Devil himself.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

This crumbling stump is all that remains of what was once thought to be the oldest living organism.

Stalactites and stalagmites in a beautifully lit cave.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

The titular "little arch" near this Italian resort is one of the most popular diving spots in the country.

This Italian foot path winds through the mountains via 52 individual tunnels.

A small section of Boise, Idaho maintains the unique culture and traditions of the Basque people.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

The longest living non-clonal organisms on Earth.

A shady solar power system that couldn't hold up to the harsh desert conditions.

A multi-storied adobe complex has been inhabited for more than a thousand years.

When ecosystems collide in the arid Southwest.

The largest self-built castle in the U.S., six decades in the making.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

The largest island on the great salt lake is home to curious creatures and strange stories.

Come for the speed, leave in love with the desert.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

Massive crater in central Oregon.

A volcanic landmark located on an Ice age lake bed.