The Multimedia Companion for the special issue of Urban History: 'Transnational Urbanism in the Americas', is an editorial project of Urban History’s North American Editorial Board. The emerging transnational paradigm raises many interesting possibilities for the historical study of cities. As the articles in the special issue suggest, transnationalism challenges us to map out the patterns of human life in new ways as they cross and construct cities, nations, and other crucial formations. Even as this new paradigm is causing a fundamental rethinking of our scholarship, the internet and the World Wide Web are also challenging our current modes of scholarly communication. The initial impetus for the Multimedia Companion was an attempt to match these challenges through a hybrid of cartographic, narrative, and photographic forms. In this Companion, readers will find a diverse range of material: