Near the Hospiz in the municipality of Airolo, the visitor gets a vivid impression of the Gotthard myth and hears about interesting aspects of mobility, water, energy, weather, climate and safety. The theme world is housed in an impressive tunnel and in rock caves of the former fortress «Sasso da Pigna». Visitors experience first hand what sustainability really means. Man’s use of natural resources takes center stage. In the long tunnels deep inside the mountain, an underground train connects the historical fortress to the spectacular illuminated caverns of the themed multimedia exhibition.