Well, we did end up with two entries, so this round will not go uncontested! Check them out here, then vote for your favorite to win this round of Map of the Fortnight!
I think cultural holdouts are fascinating, especially ancient ones.
@Prince di Corsica I presume that these Celts are descended from the Cantii the Romans encountered? Also what did actually happen to Canterbury? To prevent significant butterflies you need to keep that particular town and the Archbishopric to preserve a fairly intact history of England.