Ancient pueblos built into the base of a natural canyon wall.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

An urban laboratory.

This historic national park is covered in the stunning ruins of red rock pueblos.

A spiritual vortex among the red rocks in Sedona.

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

A reproduction of earth's many biomes.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A self-built castle made by a mysterious man.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Oldest building in California still in use.

An extraordinary final resting place full of oversized art, amazing statues, and dead celebrities.

An optical illusion found amid a logged redwood forest.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

This unlicensed collection of fast-food memorabilia sits on the site of the first ever McDonald's restaurant.

The unbelievably opulent home built for an infamous newspaperman.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

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

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Quite simply the largest tree in the world (by volume).

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.