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

The remnants of a creative early method of wildfire prevention.

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

For those going through a life transition, a place to leave behind a piece of your former self.

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

This Asheville chair museum wants to revive a dying art.

The secret city built by the Manhattan Project.

An abandoned town is hidden in Great Smoky Mountains National Park.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

A historic dam made famous for its turbines and feature in a Hollywood classic.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

The pan man stands as a testament to the functionality of American cast iron cookware.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

More than five miles of underground passageways.

Georgia's highest point was given its strange name thanks to a simple translation error.

Inside this small brick bungalow is a collection of toys intended for the afterlife.

The legacies of two historic Black American institutions live on in this unassuming brick building.

A sweet tribute to Georgia's official state vegetable, which even has its own mascot: "Yumion."

The abandoned bathhouse is all that remains of the hot springs considered Florida's original tourist attraction.

The ruins of a creative scholar's fantastical unfinished sanctuary act as his massive gravestone.