: Ancient Europe of course!
: And remember, there is Europe in Bungie's story, Marathon
: was launched the same time the Persians were fighting
: the Greeks, so there you go, :)
And, if you recall, the original story for Pathways into Darkness was set in Europe of Charlemagne's era; a fragment of the history from this story is found on a secret terminal in Marathon.
I think the conclusion is obvious--the Mythworld is an alternate timeline of the Marathon world, where the W'rkncacnter crashlanded in Europe rather than the Yucatan, thus producing a different pattern of evolution. :-)
--SiliconDream