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

One person's lost luggage is another person's treasure.

This papier-mâché diorama celebrates an unusual landmark: the brightly-colored runoff from a local sock factory.

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

The longest non-mortared wall in the country is one man's tribute to his displaced Yuchi ancestor's five-year journey to her homeland.

Underneath this water pump, Annie Sullivan helped Keller speak her first words.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

You'll need cowboy boots to trek to this old-fashioned saloon nestled in a giant natural cave.

The highest point in Mississippi is a hilltop that was once used to bombard a nearby town with artillery.

Instead of becoming a power plant, this abandoned complex became a massive letdown.

A house built specifically to shelter the dead.

The former home of the 11th president of the United States.

The pan man stands as a testament to the functionality of American cast iron cookware.

Known by many as once the world's smartest horse.

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

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

This lavish abode was once the home of the inventor of "Gorilla Pants."

This limestone outcropping was once a ceremonial site for ancient Native Americans.

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

In the hometown of the Grand Ole Opry star is a larger-than-life memorial statue made entirely from chicken wire.

A fictional Coupe DeVille built by hand and gifted to the Man in Black himself.

The first full-scale tunnel built in America is short but scenic.

Dinosaurs invade a suburban Nashville neighborhood.

The grave of the 19th-century sea captain who coined the phrase "Old Glory" can be found in this quiet cemetery.