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.

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

This is not your typical jungle gym.

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

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

This mosaic-covered bar is brimming with curated curios.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

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

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

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

Community bookshelf of 25-foot-tall book spines.

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

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

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

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

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

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.

The abandoned remnants of a little sanctuary for world peace that fell into disrepair.

Whimsical cartoon cars suspended on posts soar over an automotive shop.

This once rural mansion now sits in the heart of the city.

Underneath downtown Lincoln resides a network of caves that was also the city's first brewery.

This was the first homestead registered after President Abraham Lincoln signed the Homestead Act into law.

An idle pastime becomes a record holder in Boys Town, Nebraska.