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

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

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

Though it may look like it’s missing its outer shell, this skeletal cast-iron tower was built to withstand wind and waves.

Manatees congregate around a power plant's discharge canal where the water is especially warm.

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

This Florida museum dedicated to western artwork is entered through an artificial canyon with imported sandstone.

A creative deviation in this post office's design was once a source of controversy.