The ruins of a 19th century shelter run by the Independent Order of Odd Fellows.

An urban forest overtakes what was the greatest failure of utopic urban housing.

A big museum full of little worlds.

A 35-foot-tall fork stuck in the ground outside an office building in Missouri.

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

A mysterious light of unknown origin on the backroads of Missouri.

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

Tucked away between two 19th-century buildings, this small shop specializes in the macabre.

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

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.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

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

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

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

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

Curious cave that stays a cool 56 degrees all year long.

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

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

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

Tucked away down this Baytown alley exists a one-of-a-kind art exhibit of technicolor umbrellas.

At the "Garage Mahal" in Houston, car culture is about more than just driving.

It specializes in outsider art and artifacts of secret societies.

The world's largest squirrel statue clutches a pecan bigger than your head.

A recreated Stonehenge stands in a country field, complete with Easter Island moai heads standing as sentries.