"Once Upon a Time": A Proof of Concept Augmented Reality Collaborative Mobile Application to Discover City Heritage

In this paper, we propose an innovative mobile application to discover and valorize city heritage and its identity considering the city as a outdoors virtual museum. The application, namely "Once upon a Time" Magic GLASS, aims to exploit digital images of city glimpse preserved at National Central Library of Florence to provide an immersive experience to the users, that through the smart devices can look at the city as it was. This project paves the way for a new class of applications able of exploiting long term preserved digital objects.