3 Cavulli, F. Grimaldi, S. Pedrotti, A. Angelucci, D.E. 2007 Toward a comprehension of archaeological visibility: the case study of Trentino region (Southern Alps). Hidden Landscapes of Mediterranean Europe: Cultural and methodological biases in pre- and protohistoric landscape studies Siena 25-27 May 2007 visibilità, siti, Trentino