The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

This opulent hotel has been visited by Spider-Man, Charlie's Angels, and the Ghostbusters.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The legend associated with these ruins understates the splendor of the mansion that once stood here.

Nature took her revenge on the "Wickedest City in the World."

The subtle interplay of fire and water is hard to ignore at this remote Jamaican spring.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

You may get stranded and everyone's peeing in the water, but at least there's cocktails!

Cavernous opening completely encased in Karst limestone.

One of the deepest blue holes in the world.

In paradise, feral pigs have claimed an island all to themselves.

A paradise hotel turned from opulent to overgrown.

These two giant boulders mysteriously perched on a 60-foot cliff may have been slung up there by a raging tsunami.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

After a long career, a disastrous sinking, and a half-successful salvage, this Naval vessel-turned-artificial reef ended up exactly where she was supposed to—with a little help from nature.

Stay in a room with a view... of the bottom of the ocean.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

The world's only underwater laboratory where "aquanauts" study oceanic life.

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

This lush Florida island is home to the ruins of a crooked ship breaker's tiny empire.

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

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

Six miles off the coast of Key West, a former military transport ship is now one of the largest artificial reefs in the world.

This legendary "evil" doll has been haunting the citizens of Key West for over 100 years.