An abandoned factory along the Mississippi coated by a giant mural.

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

Where the author wrote her beloved "Little House" books.

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

An unexpected but incredible collection of wildlife dioramas spanning rainforests, swamps, forests, and plains.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

A kitschy, creepy St. Louis mainstay.

An abandoned concrete jungle surrounded by a lush park.

An urban forest overtakes what was the greatest failure of utopic urban housing.

A big museum full of little worlds.

Like Stonehenge, but with boats and oodles more charm.

This historic cliffside mansion uses a natural cave for air conditioning.

The house where the famed outlaw was shot by a dirty coward is now a museum to the criminal's legacy.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

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.

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

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

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

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

The world's largest man-made underground caverns offer unparalleled underwater wonders.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

In the heart of Brigham Young's promised land sits a festering plot of industrial ruin that has been claimed by society's outcasts.

A small flooded ghost town with a few scattered structures remaining.