It's safe—and permitted—to walk across these twin natural sandstone arches.

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

In the 1950s, two women saved this grand theater in the Colorado mountains from demolition.

Abandoned silver mine strewn with wrecked and twisted structures.

This open-air reconstruction of an Old West town, a cross between a theme park and a museum, provides an immersive historical experience.

This lonesome Monterey cypress has survived centuries of wind, salt, and at least one attempt at arson.

This peaceful garden is hidden on the grounds of a spiritual organization founded by a pioneer yogi.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

American artist J. Alden Weir purchased this 60-acre estate for $10 and a painting.

A memorial to two dedicated postal workers who lost their lives delivering mail.

Where the Border Reivers of the Johnstone clan used to hide their stolen cattle.

A hotel with a rich Wild West history of miners and bootleggers.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

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

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

Two gushing waterfalls of hot spring water within a block of each other.

Is this 47.7-mile stretch of highway the longest straight road in the United States?

This painting of a beloved dog will be on display at the Scottish National Gallery at long as the museum exists.

A solemn memorial in a majestic setting that honors a 1692 tragedy.

These formal gardens were designed to be admired from the vantage point of the castle.

A remarkable feat of Victorian engineering across the Firth of Forth.