6. Yale University
Student-faculty ratio: 6:1
Campus international relations organization: Yale International Relations Association
Why go to Yale? Its foreign-policy student group has the top-ranked model U.N. team and a whopping operating budget of $250,000, which is uses to send its members across the globe during school breaks. When you're not traveling to Singapore or Honduras, a faculty that includes famous thinkers such as Bruce Ackerman and Robert Dahl may also know a thing or two.