Curious cave that stays a cool 56 degrees all year long.

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

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

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

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

Destroyed by flood waters, prison now serves as a training ground for armed forces.

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

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

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

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

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

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