You can watch the grinding of flour for polenta at the mill, which has been active since 1950, and today is open to visitors and school trips. Near the mill the hydroelectric plant from 1920, which covered the electrical energy needs of the communities of Frasco and Sonogno. Frasco has the characteristic stone houses and the spectacular Efra waterfall, which comes from the mountain lake with the same name. The little chapels of the via Crucis are quite interesting.
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