If you don't subscribe to strangemaps, do so at once. This one is brilliant:
"This map is of the dark side of the moon, which here looks more like a Jackson Pollock action painting, its riotous colours corresponding to geological materials and phenomena. Many of the colour spots are circular in nature, reflecting the large number of meteorites that have impacted on the lunar surface, unprotected by an atmosphere, over many, many centuries. The map is one of a series produced by NASA and the US Geological Survey between 1971 and 1998."