Speaking of counterfactuals, “Neu-York” (yes, via MetaFilter; sue me) if conquered by the Nazis. I would have lived on Salbei Weg (Sage Street) — if of course my Jewish relatives had escaped extermination and I had been born some kind of halfsie converso.
NewYorkistan, though, is still the best. I scanned and framed this immediately it appeared, which you remember was soon after September 11. Although it might also look like a conquered New York, I believe it is not, but rather a vision of the city as a feuding melange of tribes — a comparatively peaceable mirror of its enemies.