Trace is the study of an iPhone software application and its graphic interface. It allows people to record and share their routes and experiences. The user-generated, geotagged travel contents comprise notes, tips, photos, videos and audio recordings. People can contribute individually to broadening or modifying existing routes, characterizing and making them unique. The software and service- system is applied to the Parco Naturale dei Castelli Romani, a national park near Rome. [More]