We argue that the legitimacy of international organisations (IOs) as self-proclaimed representatives of humankind, which was unfounded from the outset, is waning. To substantiate that claim, we undertake a critical inquiry into the legitimacy of the promissory visions pursued by IOs in the field of education across three historical periods. The first traces the rationalistic educational planning and idealistic 'one world' projects of the post-World War II period. The second examines the era of globalisation, when the discourse that legitimised the educational visions of IOs shifted towards the promises of the 'global knowledge economy'. The third discusses the contemporary trend towards emergency governance and crisis narratives. While the narratives of progress shifted, a pattern that has emerged is the move towards globalism and uniformity. Drawing on insights from philosophy and historical studies of world-empire, we argue that the world-making experiments conducted by IOs were destined to be unsuccessful.