The Bavarian State Library has developed the smart phone application ”Ludwig II-Walking in the Footsteps of a Fairytale King”, which makes use of the possibilities offered by the mobile Internet for an up-to-date presentation of digital cultural assets. The app represents a location-based multimedia service for using augmented reality technology. A great variety of materials was complemented by features developed specifically for the app, such as audiovisual images, videos of expert interviews, audio recordings of contemporary witnesses. The materials had to be converted into a multitude of short text modules, structured in a more associative fashion, translated into English for accommodating a larger user population, formatted to adapt to the screen layout, and updated to the current situation. Moreover, it is also important that the app can offer a location-independent access to its content. The design is in favour of the location-based access, that is, digital information surrounds the user wherever he goes and is available ubiquitously. The real task is the mutual integration of content and context, so as to create a unique and fascinating use experience for the user to ensure a recurring and long-term user retention to the app.