This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This geothermal hot spring hides beneath a slowly growing mineral dome.

If you dial the number in this abandoned office window "Sam Spade’s" secretary will ask you to leave a message.

A huge collection of rocks, gems, and crystals.

Outsider art or homage to aliens?

Puzzling...this tree looks like an assemblage of dismembered monkey limbs.

I Street Bridge is the heaviest swinging center bridge in the United States.

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

The California capital city once stood 10 feet lower than it does today.

An eccentric home stands out in an otherwise average neighborhood with mosaics, mini topiaries, and kinetic sculpture.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

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

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

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

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

One of Europe's largest supercomputers is housed inside of a disused chapel.

A temple to modernity, tucked away amid Barcelona's more well known museums.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Mountain where Jesus was first tempted by the Devil.