The overwhelming popularity of zombies may be a relatively recent phenomenon, but in alternate timelines, zombie attacks have been a problem for centuries. These alternate history maps outline the geography these undead epidemics and the measures taken to combat them.
Earlier this fall, AlternateHistory.com held a map-making contest detailing the effects of zombie outbreaks, vampire migrations and other supernatural events in alternate history. Among the entries is a map of the Scourge from Pride and Prejudice and Zombies and a few other standouts (recommended by Metafilter).
The Great Golem Uprising of 1848 — A non-zombie entry.