A 19th-century shipwreck turned thriving coral reef.

A rare underwater observatory in the Caribbean that provides breathtaking views of vibrantly colored aquatic life.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

On this Puerto Rican island, many abandoned naval ammunition bunkers sit open while a few have been padlocked by locals as personal storage.

The world's brightest bioluminescent bay.

An underwater road considered a possible Atlantis location.

A steamer run aground near Bimini lives a second life as a playground for scuba divers.

Bermuda triangle lighthouse, site of mysterious disappearances, left to crumble into the Atlantic.

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.

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

These large-scale reproductions of Mario Sanchez’s colorful pictures and murals feel like a walk around a small movie set, and also lead you down an imaginary “street” of past decades.

This statue inspired by Renoir's famous painting embodies the jovial spirit of Key West.

A historic landmark and museum filled with curious objects representing the history of Key West.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

This small Key West museum is packed with dozens of artifacts that illustrate the life of the iconic playwright.

The island residents are known for taking their quirky sense of humor with them to the grave.

The former desk of Fire Chief Joseph "Bum" Farto is all that remains after his mysterious disappearance following a drug conviction.

Near the ruins of a Civil War coastal fortress lies the only known African refugee cemetery in the United States.

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

A nude beach alongside a washed-out road.

Bat house that has only ever housed bat for one night; they all flew away and never came back.

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

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