What you're looking at isn't currently a real thing—but with the help of some seriously affluent backers, it might become real some day. It's a design for a floating super city that holds up to 100,000 people, features a fully-functioning airport, and circumnavigates the globe. It's the single most ambitious civilian marine project of all time, and it's called Freedom Ship.
The vital statistics are somewhat staggering: it's 350 feet...tall. It's nearly an eighth of a mile wide. It's so long (4,500 ft), that if you were driving at 50 mph, it would take you a full minute to get past the whole thing. Technically no shipyard can build such a beast, but Freedom Ship will be a flat-bottomed barge, eliminating some of the engineering issues of building such a huge hull.
The sheer size continues to the population: 40,000 full-time residents with enough crew members, hotel rooms, and shopping space to bring the total daily population to 100,000 people. That's a mid-sized suburb.
Up top, there's a runway that can handle just about any 30-40 passenger turboprop, while down at sea level, there's plenty of docking space for yachts.
There're parks, too. Also: hotels, schools, hospitals, and anything else you'd expect to find...anywhere.
There's even a full real estate program—units start at under $200,000—for anyone that truly wants to live in the non-post apocalyptic version of Kevin Costner's Waterworld.
Sure, the name, and even the concept conjures up images of an ill-fated utopia, but the Floridian group behind the project is insistent that there's absolutely no societal upheaval intended: the ship will function under international maritime law, which, since it will sail under a United States flag, means daily life will more or less carry on like anywhere else in America.