Prince2 is becoming internationally recognised. There is also the Project Management Institute (PMI) which has professional exams and certifictaion. Prince2 and PMI are very compatible. The PMI has a thing it calls the Project Management Body of Knowledge (PMBoK), which is the syllabus for its exams. Although not trully a methodology (unlike Prince2 which is a method), it is very comprehensive and represents "Best Practice" from hundreds of PM vetrans. If you had PMI certification and passed the Prince2 training, you could then take on everything projects could throw at you