This essay draws on the author's personal experiences as a head of school on three continents, over 20 years, as well as on some of his recent writings and talks. From Martin Luther King Jr's idea of a world house is derived the concept of a "world school". This project charts a way for national schools to develop world-minded graduates. It is claimed that the current state of international education has created an open space for all interested schools to learn both from and for the world. Five thematic visions of learning for the benefit of our world are discussed. Also outlined is a teacher profile for world school teaching, and the article concludes with a case study drawing on the author's current school and changes that it has implemented over five years. (Contains 1 figure.)