Castello di Moccò, Medieval castle in San Dorligo della Valle, Italy.

Castello di Moccò sits on a hilltop between the Karst plateau and Mount San Michele, overlooking the Rosandra Valley and the Bagnoli settlement below. From this elevated position, the fortress could control access to both geographical areas and served as a key defensive point at this strategic border location.

The castle was first mentioned in 1233 as "castro de Muchou", held by the bishops of Trieste, who built it to control the trade route from the salt pans to Ljubljana. Rebuilt at the Patriarch of Aquileia's expense in 1268, it passed between Trieste, Venice and the Austrian dukes; the Venetians lowered its towers in the 15th century. In October 1511 Trieste's forces under Bishop Peter Bonomo, with Czech infantry and Croatian cavalry, besieged it and the Venetian garrison surrendered after twenty cannon shots.

The fortress reflects how border defenses were built and modified over time, with its original towers later adjusted to match the surrounding walls. These changes show how the structure adapted to different defensive needs as military techniques evolved.

Only the northwestern side of the hill gives access to the summit, where the castle entrance once stood; the other slopes are steep. The ruins are reached on foot from the Breg area near the cemetery of Sant'Antonio in Bosco, above Bagnoli della Rosandra. Little built structure survives, so look for the foundation grooves cut into the rock and the 9 m wall with its arch.

A 9-meter section of wall with an arch opening remains visible and bears traces of World War I modifications. The opening was altered during that period to accommodate a machine gun position within the fortress's defensive line.