Following the course of the Trallo it is therefore possible to retrace a part of the history of Brusimpiano: some remains of the mills are still visible. The area is also characteristic from a mineralogical and fossiliferous point of view, as the abandoned mine shows. The arrival point is a suggestive waterfall of clear water that falls from a height of about ten meters into a pool dug into the rock, like in a glass of champagne, forming foam, dust and rainbows. From there the Trallo begins its course, silent and slow, descending in leaps into the narrow gorge of the valley.