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

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.

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

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

It's hip to be square in Iola, home of the largest town square in the United States.

This unusual sculpture honors the city's namesake, Octave Chanute, for his pioneering work in early aviation.

This museum houses artifacts from American adventurers and filmmakers Martin and Osa Johnson.

Hundreds of samples of "Devil's Rope" hide in a defunct vintage elevator.

The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.

This Wild West attraction is probably more fiction than history, but that doesn't mean it's not awesome.

This Italianate Villa-style castle is pretty to look at, just keep off the private property.

Step back in time at this 1950s display home, built to showcase once cutting-edge electric amenities.

A house turned museum is the real-life "home" of the fictional main character of The Wizard of Oz.

At a mile long, the Fort Madison Bridge is the largest double-decker swing-span bridge in the world.

No one knows the origin of this small town’s unique name.

An unlikely Transcendental Meditation haven in the American Heartland built around the ancient Vedic principles of balance and harmony.

An underground wonderland in Iowa.

The oldest university museum west of the Mississippi retains its 19th century feel.

The “American Gothic" artist's largest works hang in an Iowa State University library.

This simple home was the beginning of a long journey for the iconic Western film star.

An Iowa town celebrates its heritage with the tallest working Dutch windmill in North America.

The remains of a bustling turn-of-the-century park built to showcase the wonders of electricity.

While there are no actual snakes in the history of this crooked road, there may be a number of dead horses.