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

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

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

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

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

The only Florida state park with publicly accessible caves.

A striking lighthouse with views of the Gulf of Mexico and of a military air show.

This now-deactivated naval base defended the Florida coast for centuries.

A much more welcome kind of snowbird vacationer, manatees camp out in these springs every winter.

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

A circus legend leaves an unexpected endowment.

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

The museum chronicling a treasure hunter's dream, fulfilled.

The highway's southernmost spot is a beloved local attraction.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.

Bat house that has only ever housed bat for one night; they all flew away and never came back.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

After a long career, a disastrous sinking, and a half-successful salvage, this Naval vessel-turned-artificial reef ended up exactly where she was supposed to—with a little help from nature.

An underwater statue of Christ blesses the coral reefs off Key Largo.

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

Former villa and estate of James Deering developed to preserve native tropical forests.

Located within a historic park, the beacon is the oldest standing structure in Miami.

A community of collapsing homes more than a mile out from the Florida coast.