You were once able to challenge a chicken to tic-tac-toe at this park, which is now converted into the Aikman Wildlife Adventure.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

A downtown park built on top of unclaimed graves.

The park that the Chicago Stockyards built.

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

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

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

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

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

Massive still life just off the highway in Kansas.

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