Natural sonic phenomenon comes with a grisly legend of murder and blood.

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

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Larger-than-life cut-out murals of James Dean and Elizabeth Taylor, dedicated to their 1956 film ‘Giant.’

Water still flows through the oldest Spanish aqueduct in America.

This small stone building, the final work of a renowned artist, offers a peaceful environment with radiant, colorful glass windows .

An unusual bed & breakfast made of papercrete.

With print dying, this local paper keeps the lights on by doubling as a stunning cafe and cocktail bar.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

Minimalist modern art on a repurposed military base in rural Texas.

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

This old abandoned sign flickers to announce a motel that isn't even there.

Three hundred years of preserved Spanish colonial history in San Antonio.

A Prada store in the West Texas desert that is never open for business.

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

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

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

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

The world's largest wooden structure.

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