Some 10,000 works of ancient rock art cover these volcanic basalt outcrops near the Gila River.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

This small fort played a huge role defending Puerto Rico’s capital city.

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

This highest peak in New Mexico is named after an explorer who had a habit of lending his monicker to peaks.

The oldest standing structure in downtown San Diego.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

Art Deco stylings conceal the true nature of this bridge.

This clock was gifted to Mexico as a show of gratitude for its long history of welcoming Arab migrants.

A grand entrance to one of the world's smallest Chinatowns.

This mysterious petroglyph evokes the ancient swastika symbol but was later vandalized with the more troublesome Nazi one.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

Historic funicular railway, believed to be the shortest railroad in the world.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

World-famous, Pink's still manages to keep its prized cult fetish status.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The final resting place of one of the most sensational guitar players of all time was created only after his father got the rights to his music.

"Girl in a Wetsuit" is what happens when a sculptor has to find a way around a 100 year old copyright.

The magic's in the hole!

This century-old confectioner's outlet store was plucked right out of the Seattle World's Fair.

A beautiful footbridge with over 2,000 glass sculptures along the walls and ceiling.