Play over 120 retro arcade games and pinball machines at this throwback museum.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

One of the oldest, tallest, and most haunted lighthouses in America.

Approximately 65,000 gallons of crystal clear water pour out of this headspring every minute.

These mysterious ruins are hidden amid this sleepy coastal city.

Believed to be haunted, this old cemetery is beautifully adorned with Spanish moss hanging from the trees.

Despite being made of a seashell mortar, the crumbling remains of this historic Florida mill are still standing.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

An abandoned railroad tunnel forgotten by time awaits inquisitive hikers.

In Rickwood Caverns, visitors can travel hundreds of feet underground and see beautiful formations unique to the region.

An impressive collection is dedicated to the legendary beast.

This former maximum-security prison is creepy, sobering, and supposedly haunted.

Enormous lake at the bottom of a unique cave system.

This defunct, fortress-like prison has been the setting for several movies.

This park contains one of the largest concentrations of cedar glades, a unique and rare ecosystem.

These early tent-shaped grave coverings are unique to Appalachia.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

An ancient cave system in Tennessee’s Appalachian foothills converted to a 1,200-person music venue.

This mansion turned restaurant was once a pitstop for Al Capone during his travels.

Mysterious library of an infamous financier and spiritual seeker.

Tour the sci-fi-esque reality of governmental disease management.