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

The world-record holder for the longest bridge stretching continuously over water.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

A mysterious castle built as a monument to lost love.

This kitsch eatery is chock-a-block with bric-a-brac.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

In a city crazy for seashells this museum educates and amazes visitors using the wonder of cast-off exoskeletons.

An important Mayan religious and trading center dating back to 200 BC.

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

This railroad and oil tycoon's lavish estate now stands as a time capsule of the Gilded Age.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

At the time of its completion, it was the tallest dam in the world.

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

A unique collection of diving equipment spanning antiquity to the present day.

This stretch of highway is said to be haunted by ghosts of settlers whose graves were paved over.

The oldest family-run restaurant in the United States is a living museum of New Orleans dining history.