What is a good school to go to for diplomacy and international relations/studies?

I am a college Sopre and currently live in Pennsylvania and am an International Relations major and I want to know what is a good school to go to for diplomacy and international affairs/studies. I want to become a diplomat/ foreign minister/ or ambador, something of that sort. I also plan on furthering my education and getting a masters and perhaps a PhD. What is a good school to go to for this?