The seventh largest spring in the world.

It's as if the herds walked straight out of a fairy tale into the Missouri wilds.

An average of 33 million gallons of water pour out of the collapsed cave at the heart of this spherical spring.

A historic, scenic mill that was forced to close due to overlogging.

Around 50 million gallons of water flow from this spring every day.

The largest riverfront opening cave in the Ozarks.

A Jurassic artscape composed of transmission casings and other mechanical parts.

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

A floating museum that was sunk by a flood and left to rot in the tides.

This "little gallery in the middle of nowhere" is housed in a 170-year-old horse barn in the Missouri Ozarks.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

Self-built house and sculpture park where the creator can still be seen in a glass coffin.

Home to Hollywood history and a very special salt crystal.

An abandoned meat mecca now serves as an excellent locale for urban exploration.

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

Less a museum than a bizarre fantasy world created by artists and engineers.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

This pristinely abandoned filling station on the edge of a graveyard is populated solely by unsettling mannequins.

This 40-foot fowl marks the so-called "wild goose capital of the world."

A museum dedicated to man's boldest venture.

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

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.