How long does it take to travel from London to elsewhere? The answer is provided by this map, showing a set of expanding circles centered on the British capital, each bigger one delineating two extra hours of travel time.
The familiar shape of the world is morphed into grotesque, contorted shapes as these isotemporal lines replace the usual lines of longitude and latitude for frame of reference.
This is from 1981, so it’s not quite as accurate any more. I’d love to see it redrawn.
(Via Strange Maps.)