Biasca
An avalanche from the Monte Crenone (now called Pizzo Magno) in 1512 buried many houses in Biasca and killed hundreds of people. This was one of the big avalanches in the Alps in modern times. It dammed the Brenno, forming a 14 kilometer long lake. This dam broke in the spring of 1514, flooding the Ticino valley to the Magadino plain.