Forever immortalized in concrete, this Simpsons etching was crafted by show creator Matt Groening.

A devastated ruin in the south of Belize where British explorers claimed to unearth the Mitchell-Hedges Crystal Skull.

A logging-themed roadside restaurant surrounded by museum-quality machinery and artifacts from the industry's heyday.

Limestone caves with spectacular showcase chambers.

A Wild West jailhouse that slid down the mountainside.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.

These free-roaming horses were once destined to disappear from the land.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

The unusual burial monument of Arizona's first governor.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.