The so-called "world's shortest river" is actually a window into a cave.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

Strange beasts lurking in a garden are all that remain of a quirky, short-lived theme park.

Jacksonville's highways rendered this century-old grammar school unusable.

A luxuriant botanical garden below sea level.

A humid oasis combines recreation with exploration in a unique underwater cavern.

A secret, rocky playground hidden amongst the plain white beaches of the Florida coast.

Florida castle built with aluminum printing plates.

In Florida, these naughty monkeys live on their own mini-monkey Alcatraz.

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

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

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

Where manatees are the snowbird vacationers in these balmy Florida springs.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

An underwater city for the dead.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

These ruins are all that's left of the former Alabama State Capitol.

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

The highest point in Alabama was almost completely deforested, but is now home to protected towers and trees.

148 feet long and in the middle of a verdant forest.