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

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

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

It's a pretty creepy lock-up.

Arrr! The most authentic collection of pirate artifacts in the world... matey.

This curio museum seems like the type of place you might find a mogwai or a monkey's paw.

The site of Martin Luther King Jr.'s arrest as he attempted to have lunch.

St. Augustine's record-setting narrow street was designed to protect against pirates.

Bronze footprints mark the path where a civil rights leader tried to march in peaceful protest before being knocked unconscious.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

Possibly the world's oldest rug, this Egyptian relic is woven entirely from ancient cat hair and once carried a mummified human foot.

A lion given to the prime minister somehow got stuffed and sent to Florida.

A tribute to Ponce de Leon's supposed quest for eternal youth.

The only Florida state park with publicly accessible caves.

One of the best places in Florida to spot rare, carnivorous pitcher plants.

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

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.

A statue honoring 44 continuous years of greeting passing ships.

Where school buses go to die and be reborn as whimsical works of art.

A wonderland of folk art including the World’s Largest Grit. 

A massive tribute to this small county's top agricultural product.

A real (but thankfully not live) missile stands tall as a monument to the United States military in the small town of Cordele.

The first integrated firehouse in Atlanta houses a museum on the history of desegregation in the city's fire department.

One of corporate America's best-kept secrets is also one of the most publicly displayed.