A museum devoted to osteopathy and its creator, Andrew Still.

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

A museum dedicated to man's boldest venture.

A kitschy, creepy St. Louis mainstay.

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

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

This is not your typical jungle gym.

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

This abandoned prison castle has become an imposing gallery of graffiti art.

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

European castle ruins in an American state park are actually the product of death and grief.