Talk held at Urban History Exhibited. Seminar at Den Gamle By in Aarhus, Denmark. 25th October 2011. Rainey Tisdale, Community Fellow at John Nicholas Brown Center for Public Humanities and Cultural Heritage, Brown University. 25th Oct. 2011 Abstract: I spent 2010 surveying city museums in Europe and the United States as part of a Fulbright-sponsored research project. Since then I have continued to closely follow developments in this field in order to determine what we are doing poorly, what we are doing well, and what the 21st-century city museum should look like. Drawing from this work, my paper will explore recent trends in urban public history, particularly those taking place outside the walls of the physical museum, including geo-tagging, pop-up museums, user-generated content, and hyper-local history projects. I will also discuss what these trends mean for city museums and for our audiences. I will end with my personal vision for the 21st-century city museum.