The maximum security facility was once thought to have "the bloodiest 47 acres in America."

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

Like Stonehenge, but with boats and oodles more charm.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

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

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

A sculpture of a giant man escaping from the depths of the Earth.

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

A plaque on the side of a parking garage marks the burial place of a great Ottawa chief.

One of the world's earliest skyscrapers.

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

The only Florida state park with publicly accessible caves.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

A humid oasis combines recreation with exploration in a unique underwater cavern.

Come for the boats, stay to explore the intriguing assortment of art.

Kentucky's longest operating jail is now a spooky spot to spend the night.

Bizarre and inspired combination store selling only two items: tires and bibles.

An ode to "The Queen of Appalachia."

The world's largest version of this iconic puzzle cube is located in Knoxville, Tennessee.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

Before TV meteorologists, there were weather kiosks. This may be the last one in the United States.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

A full-scale replica of a 1774 colonial settlement in Kentucky.