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

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

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

Mariners once used this prehistoric landfill as a navigational landmark.

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

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

A luxuriant botanical garden below sea level.

This small museum gives visitors a chance to soak up the history of the "sponge capital of the world."

An octet of classic chrome trailers speared into the ground act as a tribute to the silver bullets of the open road.

Nearly 200 prehistoric giants lurk among the trees at this theme park.

This facility, now a museum, once housed and trained U.S. Army Air Force pilots who flew during the Allied invasion of Normandy.

Meet manatees face-to-face at this zoo for native species.

Ruins of an old sugar mill sitting quietly next to a park in rural Florida.

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

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

Step into the past and experience what life was once like in the Sunshine State.

Florida’s largest fish hatchery features aquariums, fishing ponds, and local taxidermy.

A beautifully detailed Victorian house designed to be easy to flee, built by a man haunted by fire.

This historic oak tree has been around for over 300 years and might last for 300 more so long as it doesn't fall apart first.

Incredible miniature towns and buildings created and decorated with thousands of tiny rocks.

Live long and prosper in Tennessee.

More than five miles of underground passageways.

This historic train station has been converted to a locomotive themed hotel.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.