The Second Death of the Red World
Created by Ammonoidea on deviantart, this is a different sort of map from most on here. Not only depicting another world, but an alternate future (hopefully) rather than the past. Here, humans colonized Mars and began the process of terraforming...only to be stopped when a mega-virus ripped through Earth. Though the virus was stopped before it reached Mars, the people there lack the resources to continue terraforming the planet, leaving the Red World to die for a second time.