I also wonder what you mean by "international law." This phrase is used to mean a variety of things. In its most literal sense, the practice of "international law" would essentially be limited to proceedings in the Hague. Was that what you meant? If so, you might consider a law school that is tied to political power centers, such as Georgetown, or any of the very top-ranked law schools.
More commonly, the phrase may refer to what is essentially "multi-national law," i.e. cases or transactions with participants or features from several countries. If this is what you meant, than you can find happiness in a variety of places, as most of the world has some international feature these days - particularly if you go into corporate/business law.