For visitors wishing to know more about Viterbo and its monuments, there is Viterbo Touch which allows you to download an interactive map of the historic center and all the major sites outside the city walls, like San Martino al Cimino, Bagnaia and Castel D’Asso, to name just a few.
Once the map is downloaded internet connection is not needed and it can be used even in places where there is little or no connection.
You can admire interesting places and learn about them thanks to the links in the different paragraphs.