I love visiting McDonald's when I'm traveling (plus they have free toilets, which is a rarity in most of Europe). England and Italy definitely have the best McFlurry combinations: caramel cadbury flake in London and chocolate brownie in Rome. Spain had dollar menu gazpacho which was surprisingly good and (gasp) healthy. It was funny to watch fathers take their kids in to get ice cream and come out with a plastic cup of beer for themselves. Israel has kosher McDonalds, but I'm not sure how they did a cheeseburger, since I stuck to the chicken.

Also what I've found hilarious is promoting exotic 'global' flavors at McDs. In London in 2008 they had a whole Americana burger promotion: a different American burger (East coast, Tex Mex, etc) every month for 4 months. Italy was advertising a Greek sandwich in a pita with tzatziki sauce. I can't remember what Budapest had, although I know they had some local thing, too...