The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

This abandoned amusement park was built on a site with a dark history.

The oldest remaining authentic Putt-Putt course that Donald Clayton created in Ohio.

A toxic ghost town sitting atop a massive coal fire.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

An idyllic mineral hot springs facility with a more-than checkered past.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

A hidden beach at the end of a tunnel of mangrove trees.