In the context of Images for the Future, The Netherlands Institute for Sound & Vision R&D department has designed and developed a complete technical architecture to support (mobile) location-based services for cultural heritage. This October, Sound & Vision will launch the first implementation based on this architecture in the form of an iPhone application that offers mobile access to relevant audiovisual heritage related to war monuments. The architecture developed by Sound & Vision is based on a Drupal installation that connects to relevant open content repositories (for now: Open Images, Flickr: The Commons and Wikipedia) using their respective API’s, and enables the creation of (mobile) location-based services for cultural heritage. Locations in the real world are linked to digital heritage available online. By building a location-aware application that utilizes the location information and related audiovisual heritage stored in the Drupal installation, users can access relevant information – based on their GPS location to enrich their on-site experience. The architecture also supports applications to enable users to contribute comments and images to the locations themselves. To promote reuse and further development of the architecture and to ensure that other institutions can easily participate, the complete architecture is based on open source components. Because all information and relations to the online content are centrally stored, it is relatively easy to develop applications on top of the Drupal based architecture. Because the content is separated from the application, this also makes the applications very lightweight. Applications can be an iOS based application (like our first iPhone application), but with a similar effort this can also be an Android of Symbian based application.