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 lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

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

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

Now nearly abandoned, Kaskaskia was once the capital of Illinois and one of the most important towns on the upper Mississippi.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

The only road through the heart of Glacier National Park.

New fungal and bacterial species call this deadly lake home.

An adorably sweet display of sculpted Precious Moments figurines.

This former small town was destroyed not by the motor oil it sprayed the ground with but by the toxic waste that was added.

The world's second largest rocking chair is found on Route 66 in Cuba... Missouri.

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

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

This is not your typical jungle gym.

Giant granite rocks standing end-to-end like a train of circus elephants.

Erosion and time have created a naturally-formed water park.

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

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

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

A big museum full of little worlds.

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

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