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

Illegal drag racing two stories beneath Chicago’s streets.

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

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

To find the "unicorns of the deep" you've got to go downstairs.

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

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

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

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

A river with some unusual, and occasionally dangerous, habits.

A six-story-tall golden pyramid, surrounded by a moat.

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

First planned industrial community in the United States.

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

A gothic church spire sits atop this skyscraper, the tallest church in the world.

A hollow cement depiction of time's inexorable effect on the human body.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A cemetery housing wild west legends in South Dakota.