Since 2015 when migration across the Mediterranean was declared a “crisis” in Europe, the language of crisis and invasion has persisted, structuring conversations and political imaginations. This has led many to argue for the strict closure of borders and the deportation of migrants or “people on the move,”1 and to a deepening set of racisms within borders. But this “crisis” has also led to a less publicized, opposing struggle against borders, in the service of a more egalitarian world. I argue that in order to really understand how borders are being regulated or unregulated, we need to look not only at the international legal realm, but also at infrastructural politics.2 In this Essay, I will discuss two different terrains of infrastructural struggle over migration and borders: the first is about border walls, which are built to close off resources and partition the world into haves and have nots; the second is an infrastructure of collective living, where people-on-the-move are occupying abandoned spaces and working against borders and private property. I suggest that it is important to attend to the infrastructural dimensions of migration and border regimes, as they can produce and regularize exclusion and conceal it from the conventional field of political discussion and legal contestation. At the same time, new infrastructures can prefigure better, more equitable worlds.