This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

This former office building has been transformed into an immersive music venue and art space.

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.

Enjoy classic musicals with a home-cooked meal at this former staple of American social life.

An experimental, automotive replica of Stonehenge.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

This spectacular track has run continuously since 1882.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

At the time of its completion, it was the tallest dam in the world.

A popular rock that acted as a waymarker for American pioneers.

This UFO landing strip was created by a charitable Wyoming city that was worried about residents of Jupiter.

Only museum dedicated to women pilots, with personal artifacts from Amelia Earhart and other aviatrixes.

This beacon for pre-radar pilots once guided Charles Lindbergh to a safe touchdown in Tulsa.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

A cemetery housing wild west legends in South Dakota.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

Just a man taking his prehistoric pet for a stroll.