This spot in St. Louis, marked with a simple sign, has seen more pro baseball than just about anywhere else in the world.

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

Over 600 vacuum cleaners stack the shelves of what may be the cleanest museum in America.

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

A floating museum that was sunk by a flood and left to rot in the tides.

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

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

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

This is not your typical jungle gym.

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

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

Man-made geyser that rises to the exact height of the Gateway Arch.

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

First known as the "Sample House," this construction mash-up was meant to be a living catalogue of building styles.

The world's largest collection of the world's largest objects is in one small Illinois town.

The mysterious white squirrels of this Illinois city are treated like sacred cows.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

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

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

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

Home with Gothic windows featured in a famous painting.

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

Lured here by the promise of tens of thousands in gold, Jesse James started a quintessentially American trend of robbing trains in-motion.

The notorious couple camped at this site after a bloody shootout with police.