In fact, your steps will soon lead you to the bed of the Rui stream, which you will have to ascend carefully; the moss and seaweed make the path slippery, so in order to avoid accidents you shall be properly equipped with trekking shoes. The small Grotto stands out at the bottom, among the stratified rocks, with its characteristic colour between blue and green and the roar of the small waterfall. Return by the same route or, if you wish to lengthen the hike a little, go up the tarmac road that passes the solitary church of San Donato, a church of Lombard origin.