I've never seen Batman appear outside of Gotham. Maybe originally it was easier for the creators to keep him in this fictional, NYC lookalike, but in today's society, I would expect to see a more 'internationalized' Batman. I think the fact that Batman remains a strongly American character speaks to racist and xenophobic undertones in the work. Sad in such an age that this still exists. Some may say 'it's just a comic', but really, if Batman is the superhero we know him to be, wouldn't he be helping out all over the globe???
Thanks, guys.