The world's longest known cave system.

This simple, broken column marks the final resting place of one of America's most famous explorers.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

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

Home of an evil witch famous within southern folklore.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

This replica of the Greek structure is in the heart of Nashville.

The small cave that housed Tennessee's "first citizen."

The highest point in Florida is still the lowest high point in the country.

Bad farming practices caused this unnatural natural wonder.

Ancient church constructed with a special wood that preserves prints from the past.

A giant 400-acre preserve in North Florida for displaced wolves.

The site where Confederate president Jefferson Davis was defeated has been marked with a bust... that leaves that part out.

Georgia's first brewery is also one of its oldest surviving buildings.

A haunted hill that supposedly defied gravity.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A swamp that was the site of prehistoric water burials also managed to preserve its corpses for millennia.

The humble home where the famous beat author lived briefly and wrote one of his most famous works.

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

Florida castle built with aluminum printing plates.

A mysterious echo seems to defy the laws of acoustics.

An acoustic anomaly with a mysterious cause.