The show pony of cave systems, Fantastic Caverns manages to live up to its name.

Giant granite rocks standing end-to-end like a train of circus elephants.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

Erosion and time have created a naturally-formed water park.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

This abandoned prison castle has become an imposing gallery of graffiti art.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

European castle ruins in an American state park are actually the product of death and grief.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

These waterfalls can be twins or triplets, depending on how much it's rained recently.

The seventh largest spring in the world.

Home to a seasonal waterfall and swimming hole in the Ouachita Mountains.

A wild trout fishery in Arkansas.

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

Twenty-year effort to raise a castle using tools and techniques from the 13th century is now abandoned in the Arkansas woods.

This historic bridge has weathered fires and floods and still stands, now abandoned, where it has stood since 1874.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

A mysterious light floating in the trees of Arkansas may be a piezoelectric effect.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

This century-old roadside attraction is full of bizarre rock formations.

This strange, small castle on the bayou has withstood the test of time and weather.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.