Caption: "Map of the world where red represents countries which do NOT use the Metric System."

Notice who the holdouts are: Burma, Liberia, the USA, and Alaska---which seems to be an independent country dangling off the northwest corner of North America---but maybe it's just an enclave.

Credit/Permission: User:Donovaly, 2006 / Public domain.
Image link: Wikipedia: File:Metric system.png.
Local file: local link: metric_world.html.
File: Unit file: metric_world.html.