AISESEC An association called AIESEC runs international internships from 6 weeks to 18 months. It’s a global organisation run by students. They are present in over 110 countries and territories and with over 60,000 members; AIESEC is the world’s largest youth-run organization. AIESEC offers young people the opportunity to participate in international internships, global volunteering, experience leadership and participate in a global learning environment. You can teach, volunteer, intern with a start up or work within IT, marketing or Business development.