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 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.

A big museum full of little worlds.

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

This is not your typical jungle gym.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

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

For over 100 years, this Indiana town has had a tree growing out the top of the local courthouse.

Part of a worldwide art project, this mysterious semicircle of concrete shapes holds the pieces of a larger story.

This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.

Symbolic attempt to overcome the issues of life.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

You thought Santa Claus didn't exist, but it turns out you were wrong.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

The home used in just a few seconds of film that came to define the setting of a hit sitcom.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

This candy shop has been serving up sweets to the Louisville area since the 1850s.