Riserva naturale regionale laghi di Doberdo' e Pietrarossa

From Casa Cadorna one climbs the path 72 and reaches the flat summit of the Colle Nero. Here, despite the war devastation, the ruins of the walls of an ancient village (called "castelliere") are still visible.
The "castellieri" were fortified built-up areas situated on reliefs that could be easily defended. They were situated near water springs and connection ways, and were built by Indo-European populations of Balkan origin whose main activity was sheep farming. They settled in the Karst region since the Copper Age, and they stayed during the Bronze Age until the Iron Age.