Eons ago, a rushing lava river formed this pristine passage through solid rock.

The largest freshwater lake in the Florida Keys.

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

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

Over 120,000 curious objects that have shaped our modern world.

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

A monument celebrating the idea of reaching inaccessible places.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

Where manatees are the snowbird vacationers in these balmy Florida springs.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

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

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

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

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.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

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

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

When this test site was abandoned, they didn't even bother to take the rocket with them.

The secret cells in the basement of the KGB's Estonian "Grey House" have been preserved as a grim Cold War museum.

Abandoned Soviet base once stocked with short and medium range missiles pointed at western Europe.

A marvel of Byzantine engineering under the streets of Istanbul.

Once the largest unsupported dome in the world, beating out the Pantheon and St Peters in Rome.

This haunting stone chasm is a hotbed of mossy rock and English legend.

A magnificent winding road through a steep valley, with deep natural caverns at the bottom