The deepest spring in Missouri.

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

Some of the oldest exposed rock formations in the United States.

The only mill in the state that features a covered bridge.

Rusted and decayed, this former mining site is a portal to the past.

Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.

A 35-foot-tall fork stuck in the ground outside an office building in Missouri.

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

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

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

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

Giant works of art interspersed throughout meadows and woodlands offer a new discovery at every turn.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

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

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.