The World.
His Highness Sheikh Mohammed Bin Rashid al Maktoum is utterly and gloriously insane and wealthy (or a belated April Fools joke). Either way, he is apparently creating a series of islands shaped like the World, and you can buy one, assuming you're ridiculously wealthy. I can't quite decide if His Highness watched Prisoner until his mind broke, or if it was just bad science fiction novels in general.