An abandoned quicksilver mining town surrounded by the Big Bend parks.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

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

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A lush indoor jungle fills this bustling Madrid transportation hub.

Bacteria and algae give the salty water its bubblegum hue.

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

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

This portion of a lovely Belize beach is infested with (harmless) sharks and rays.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

The only road through the heart of Glacier National Park.

See massive fossils that are over 200 million years old in northeastern Arizona.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

When ecosystems collide in the arid Southwest.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Largest lake in Great Britain measured by surface area.

The heads of two giant mythological water horses honor Scotland's horselord past.