The world's longest known cave system.

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

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.

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

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

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

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

A massive bur oak tree believed to be some 500 years old is the centerpiece of this quiet urban greenspace.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

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

In the loving memory of a tragically deceased role-player this Illinois park is decked out with both dungeons and dragons.

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

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

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

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

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

Even with its slightly risible name this colossal cross is still able to inspire awe.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

An Austrian house of bones filled with hundreds of intricately painted skulls.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.