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

The face of a woman pushes its way through the earth.

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

All of Chicago's wood-paved streets are long gone but two alleys remain.

The world's only known button museum.

This museum celebrating the almighty dollar lets visitors literally stand in the shadow of a million bucks.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

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

A small burial plot formerly stranded in the middle of a road.

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

Millions of dollars worth of sculpture decorate this Iowa city center.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

A single artist is behind these large-scale models made of hundreds of thousands of two-inch wooden matchsticks.

A giant pair of thick black glasses mark the tragic demise of a trio of rock and roll legends.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

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