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 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.

A replica of one of the more than 15,000 civilian lookout towers that lined the U.S. coast during World War II.

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

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

In this small strip mall resides the largest collection of original art from the famed TV artist.

Measuring approximately 200 feet long, Swampy is the world's largest alligator-shaped building.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

Decorative shell walls built in the 1940s sit atop an ancient midden created by the Calusa Native Americans.

Wading through a small lagoon reveals a secret, wild stretch of pristine beach.

In memory of the 110 victims of ValuJet Flight 592 that crashed in the Everglades.

The sign that drew attention to a young boy's cucumber stand is now the name of his fruit superstore.

A mysterious castle built as a monument to lost love.

With nickel-steel armor and three-inch thick bullet resistant windows, FDR's train was a rolling fortress.

A plaque honors Miami's sister city in the Canary Islands, inviting one to reflect on their place in the world.

This beautiful Miami garden was designed as a laboratory for tropical plants.

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

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

A gaudy painted elephant stands in memory of south Florida's fallen carnies.

America's only city hall with minarets took architectural cues from Ali Baba and the Forty Thieves.

A self-explanatory attraction allows fans to respectfully remember and honor a comedy legend.