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.

The dream home of an iconoclastic renaissance man still stands as a monument to his domestically mundane vision.

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

Everyone and everything one man ever loved and lost, now stare into the East for all eternity.

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

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

The world's third-largest scale model of the planets.

A museum dedicated to man's boldest venture.

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

This mysterious hill seems to pull objects uphill.

Planes, trains, and automobiles have all been sunk as attractions at this Illinois diving spot.

The world's largest collection of mechanical puzzles is a cornucopia of analog bafflers.

An enormous natural sandstone bridge in Kentucky.

One man's vision and a labor of love of many.

The only freestanding table rock formation east of the Mississippi.

Symbolic attempt to overcome the issues of life.

Part of a worldwide art project, this mysterious semicircle of concrete shapes holds the pieces of a larger story.

The first spinning jail built in the United States is the only one that still turns.

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

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

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

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

Modeled after the labyrinth in Chartres Cathedral, this small-town Indiana memorial labyrinth sits half a world away.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.