Between 1860 and 1910, Berlin and Cairo went through a period of dynamic transformation. During this period, a growing number of contemporaries in both places made corresponding arguments about how urban change affected city dwellers’ emotions. In newspaper articles, scientific treatises, and pamphlets, shifting practices, such as nighttime leisure, were depicted as affecting feelings like love and disgust. Looking at the ways in which different urban dwellers, from psychologists to revelers, framed recent changes in terms of emotions, this book reveals the striking parallels between the histories of Berlin and Cairo. In both cities, various authors associated changes in the city with such phenomena as a loss of control over feelings or the need for a reform of emotions. The parallels in these arguments belie the assumed dissimilarity between European and Middle Eastern cities during the nineteenth century. Drawing on similar debates about emotions in Berlin and Cairo, the book provides a new argument about the regional compartmentalization of urban history. It highlights how the circulation of scientific knowledge, the expansion of empires, and global capital flows led to similarities in the pasts of these two cities. By combining urban history and the history of emotions, this book proposes an innovative perspective on the emergence of different, yet comparable cities at the end of the nineteenth century.