Despite strong conceptual frameworks for national museums as potential “sites of memory,” practical attempts to establish such sites can prove paradoxically forgetful. The following paper considers this apparent paradox by contrasting the highly idealized theoretical motives for a national museum of immigration in France with the concrete realization of such a museum in Argentina. Grounded in a problematic opposition between New World memory and Old World amnesia of immigration , the French museum was conceived as a form of national “memory‐work” that need not contend with the colonial past. This paper challenges that binary opposition through the example of Argentina, whose national museum of immigration enshrines a hegemonic memory of white European immigration that omits the history and present of an increasingly mestizo immigrant population. Both nations’ attempts to restitute public memory of immigration through inclusive “sites of memory” have, I argue, inadvertently highlighted their own national blindspots. The cases presented here point to the persistence of forgetfulness as a political feature of national memory, and to the often unintentional political uses of public memory sites.