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

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

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

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

During the 19th-century, this park was a vital trading fort.

One man's unrequited love stands in a glass box forever.

This is not your typical jungle gym.

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

This wooded grove of beautiful hand-built stone grottos is a hidden gem within a shuttered Franciscan monastery.

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 sculpture of a giant man escaping from the depths of the Earth.