This short invited chapter, illustrated, considers changes in our experience of the city brought about by the use of personal, portable, location-sensitive media devices. The project to which this relates is ’Ere be Dragons, a locative media technology project concerned with the relationship between art, technology and health. Funded by Wellcome Trust, it has been exhibited around the world and discussed in articles, book chapters and conference papers. Heartlands, the most recent version of the project, won First Prize at the Nokia Ubimedia award, chosen out of 140 submissions from around the world. The prize is for innovation in the field of pervasive media. Active Ingredient developed it with the Mixed Reality Lab, University of Nottingham from the original project headed by the Lansdown Centre for Electronic Arts.