Bizarre Cavern.

A Civil War Museum with some notable medical antiques.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

One street divides a single town that stands in two U.S. states.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

A rapidly disappearing authentic bit of the old south.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

You can climb to the summit of Black Mountain, as long as you sign the waiver.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

A bizarre roadside attraction and the first instance of miniature golf in the world.

More than five miles of underground passageways.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

A small storefront museum explores the history and myth of West Virginia's famous urban legend.

These rows of World War II-era bunkers were the scene of some of the infamous Mothman sightings.

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

A historic coal mine that doubles as a museum and tourist attraction.

America's post-nuclear-attack chambers of Congress.

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