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

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

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Plundered and left asunder by grave robbers, this ancient necropolis has been painstakingly pieced back together.

Carved faces add a touch of magic to this island's impressive oak trees.

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

One of the largest Native American shell middens stands 30 feet tall.

The ruins of a once-thriving sugarcane plantation that was burned in the Second Seminole War.

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

Location of a reliquary containing bone fragments of 18 saints.

The haunting remains of a failed housing development can still be found behind the big box stores that were to anchor them.

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

The third tallest lighthouse in America once guided author Stephen Crane to safety.

All that's left of the quintessential "cabin in the woods."

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

The secret city built by the Manhattan Project.

Detroit housing collective working to create an "environment for revolutionary change."

This fairytale-inspired cottage was created by a university literature professor.

A gleaming white tower in ornate Indian style soars above the low-slung bungalows of north Tampa.

Human skulls and a stuffed goat made into a rocking chair can be found at this strange little store.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

This picturesque ghost town is located on the banks of the Suwannee River.