The Paço de Mato bridge or Fontinha bridge serves an ancient path that connected Paço de Mato village to Viadal village. It is a rude, irregular granite masonry apparatus with one round single arch. Its construction dates back to the XVII/XVIII century, and uses as foundations the cliffs that line the river; the horizontal tray has a stone pavement, as well as accesses descending the steep slopes to the bridge. Alongside this, there is the ruin of an oldgranite watermill with slate roof well integrated in the mountain landscape. The Caima, a tributary river of Vouga which rises in Freita mountain, runs here in granite and with the constant flow of water, softened the landscape and shaped the rocks. Here, numerous giant kettles were dug in the riverbed by swirling pebbles that, in winter, gain the strength to create such beautiful sculptures.