Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

Built in 1869, this now-retired structure looks more like a medieval fortress than a county lock-up.

A mythical bird etched into the face of a rock doubles as the mascot for a nearby school.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

This lagomorph-obsessed Route 66 emporium is home to a giant jackrabbit that sits in a bunny graveyard.

The hometown of Popeye's creator is littered with a growing collection of granite cartoon characters.

Man-made geyser that rises to the exact height of the Gateway Arch.

First known as the "Sample House," this construction mash-up was meant to be a living catalogue of building styles.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

Oversized statues are just the tip of this nostalgic Americana roadside attraction.

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

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

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

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

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

Home with Gothic windows featured in a famous painting.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

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

Home to the deepest rift anywhere on Earth.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

The largest source of fossilized insects anywhere.

This life-size bronze statue remembers the tallest recorded human in his Illinois hometown.