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

A graveyard of bathyspheres and diving bells paints a weirdly accurate account of ocean exploration's rickety history.

A local landmark with generations of spraypainted messages, and more being added each day.

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

One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

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

Pensacola's UFO home has withstood many hurricanes—just as the experimental 1960s design intended.

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.

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

The only Florida state park with publicly accessible caves.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

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

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

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

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

Journey up the capitol building's cupola for an amazing view of Topeka.

This lesser-known geographic marker was the reference point for all surveys of the continent for 75 years.

The world’s largest combined collection of U.S. and Russian aircraft got its start in a poultry building.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Despite its name, this fast food museum is actually a replica of the ninth McDonald's store.