A series of waterfalls so massive they straddle the border of Argentina and Brazil.

This stunning mass of ice spans 121 square miles and is still growing.

Head to the mountains to catch a glimpse of Spain's endangered subspecies of brown bear.

Hundreds of preserved dinosaur footprints can be found along a hiking trail in this small village.

Stormy conditions send jets of seawater bursting through holes in the cliffs.

This species of wild goat stars in witchy legends and frolics among the park's eerie rock formations.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

A charming Spanish village sits atop this natural limestone overpass.

Stunning Roman aqueduct used for 1900 years and still standing.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

Bacteria and algae give the salty water its bubblegum hue.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

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

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.

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

Hot springs monkey spa in the middle of Hell's Valley.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

The creek where a shark wreaked terror upon New Jersey, and served as the inspiration for "Jaws."

Happy harbor seals frolic and snooze on this warm, sandy stretch of coast.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

European castle ruins in an American state park are actually the product of death and grief.