Opposite Malvaglia, on the right bank of the Brenno, is the village of Semione (402 m/1,319ft), with the ruined castle of Seravalle (12th-14th C.). In the Casa San Carlo is the Collezione di minerali with fossils and minerals from Ticino and other areas of the country (opening hours given). Below Malvaglia the valley becomes wider and more
regular, with large areas of tumbled rocks on the valley bottom. Below the narrow mouth of the Val Pontirone the road skirts the Buzza di Biasca, a great mass of debris the result of a tremendous landslide in 1512. The place from which the rock broke away can be seen high above the road on Pizzo Magno (2,298 m/ 7,540ft).