For example, the Harry Turtledove Wiki has small, but active, community of users who continuously update their encyclopedia of Turtledove's work. AlternateHistory.com also has an active thread called "TL-191: Filling the Gaps" where users speculate on the history of Turtledove's epic American Civil War timeline that the author left out. It was there where I found this map by President Mahan:
Honorable mention this week goes out to Rvbomally's "Command & Conquer" map. I would also check out Nick Danforth of The Atlantic's article on how America tired (and failed) to redraw the map of the Middle East after World War I. If you want to submit a map for the next Map Monday, email me at ahwupdate at gmail dot com with your map attached and a brief description in the body of the email.
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Matt Mitrovich is the founder and editor of Alternate History Weekly Update and a blogger on Amazing Stories. Check out his short fiction. When not writing he works as an attorney, enjoys life with his beautiful wife Alana and prepares for the inevitable zombie apocalypse. You can follow him on Facebook or Twitter.