Just minutes from the centre of Trento, the Fersina stream has carved a deep, narrow canyon where two historic dams create waterfalls over forty metres high. Visiting is only possible with guided tours led by staff from the Ecomuseum of Argentario for safety reasons. You walk on suspended walkways and stairways, between red rocks and mist, all the way to a balcony hidden behind the curtain of water.

In the 16th century, the Fersina frequently caused dangerous floods; to protect Trento, the first check dams were built at the narrowest point of Ponte Alto, the so-called Serra di Ponte Alto. These works were reinforced and rebuilt several times. In the 19th century, under the Austro-Hungarian Empire, large stone structures were constructed: the serra and, further downstream, the Madruzzo counter-dam, which still regulate the stream today. Between the two, the water plunges down forming two waterfalls that slide over layers of red limestone, with reflections and mists that change with each season.