1513 Turkish world map, full of European state secrets and snarky commentary.

The world's largest drain sits below the city of Kasukabe, Japan.

A marvel of Byzantine engineering under the streets of Istanbul.

Ancient serpentine sacrifice holder that has stood the test of time.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

A new kind of theme park for adults off the Las Vegas Strip.

Come for the speed, leave in love with the desert.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

One of many gator theme parks, abandoned in the sugar fields of South Florida.

A self-explanatory attraction allows fans to respectfully remember and honor a comedy legend.

12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

A community of collapsing homes more than a mile out from the Florida coast.

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

A mysterious castle built as a monument to lost love.

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

The smallest post office in the United States is no bigger than a broom closet.

A monument celebrating the idea of reaching inaccessible places.

The birthplace of American international flight service has been turned into a celebrity's microbrewery.

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

"We Seceded Where Others Failed."

A time capsule of Floridian history fights to survive on the banks of Chokoloskee Bay.

A nude beach alongside a washed-out road.

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

The largest freshwater lake in the Florida Keys.