One believer transformed a local curiosity into proof of Vikings on the Great Plains.

Where Elvis Presley received his first Army buzz cut.

Final resting place of Geronimo, Quanah Parker, and the first atomic gun ever fired.

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

An immersive art experience built by local arts collaborative, Factory Obscura, in the building formerly known as The Womb, a psychedelic arts center founded by the frontman of the Flaming Lips.

A trash dump made beautiful by nature's power.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

An enormous, inside-out glass globe built in 1935.

A 140-year-old castle with underground caves hidden in San Francisco.

Dramatic river bend surrounds a natural red-rocked pedestal.

A snapshot of the city's fascinating voodoo culture.

An emerald-green grotto just a short trip from Austin.

On the Oregon coast there is a natural hole that seems to be draining the sea.

Most-visited and most-photographed slot canyon in the American Southwest.

Rippling sand dunes frozen in the Arizona rock.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.

Very likely the only museum in the world that celebrates the glory of the humble banjo.

A collection of beautiful crystals shaped like freshly plucked roses.

Collection of skeletal systems from the "world's leading supplier of osteological specimens."

See the motorcycles that launched the stuntman to fame and the gear that saved his life.

The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.

This historic cliffside mansion uses a natural cave for air conditioning.