UNESCO World Day for Audiovisual Heritage, 27 October: how well do you know the Switzerland of yesteryear?
For more than 100 years, history has been documented not only on paper, but also in sound and images and on film. However, much more effort is required to preserve audiovisual sources than is the case with paper. It was with this in mind that UNESCO named 27 October World Day for Audiovisual Heritage back in 2004. The Swiss Federal Archives have created with the Federal Office of Topography swisstopo a photo quiz highlighting the importance of preserving historical audiovisual materials.