The only cave in Louisiana has played host to a state's-worth of clandestine activities.

Foragers once flocked to this big beautiful bayou to hunt for pearls.

Known as one of America's most beautiful public restrooms.

Tracks near this Texas nature site were once thought to support the Creationist belief that man and dino coexisted.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A unique geological area spiked with wind-carved rocks that resemble teepees.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

When life gave this firefighter a forest fire, he made a rough-hewn sculpture park using a chainsaw.

"I did this all while you were watching TV."

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

This sparsely populated town offers a look back in time.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

A clear blue swimming hole with hidden caves, still unexplored.

The Grand Canyon of Texas.

An acoustic anomaly with a mysterious cause.

A likeness of Da Vinci's mysterious painting smiles at passersby from the side of a barn.

There are no bodies inside these stone coffins. And there never were.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

Rare recess caves fill this unbelievably beautiful Ohio park.

A house carved into a rock in the 1940s.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.