Wot no hoverboards? A selection of notable, celebrated visions of the future from the past: Le Corbusier's city planning, Leonardo da Vinci's rudimentary blueprint for the helicopter and, er, Geoffrey Hoyle's invention of the onesie. It's a modern-day fashion phenomenon that I find baffling (nearly as baffling as the extraordinary trend in Liverpool, witnessed first-hand this weekend, of girls wandering about town with their rollers in, not letting their preparations for a big evening out stand in the way of afternoon shopping).
Anyway, on the subject of futuristic visions of cities, here's Norman Mailer's from 1965 - which he constructed out of Lego.
(Thanks to Matt for the latter link.)