Mexico City’s long twentieth century was structed by several yet ongoing revolutions, from the bloody and protracted wars over control of the capital and the country to waves of explosive urban expansion and demographic growth that transformed the ‘City of Palaces’ into one of the world’s largest and most unwieldy megacities. This presentation will provide an overview of this revolutionary century through a spatial historiography of the two great ‘monsters’ of the period, the city itself and the political party that sought to control and to govern it, the Partido Revolucionario Institutional. This historical geography will interrogate both the emergence and navigation of several major conflicts and crises as well as their enduring legacies and contemporary manifestations.