Castle of Trezzo sull'Adda, Medieval fortress in Trezzo sull'Adda, Italy.
The Castle of Trezzo sull'Adda is a medieval fortress in the town of the same name in Lombardy, set on a rocky spur inside a bend of the Adda River. The central tower rises 42 meters (138 feet), and the five-sided enclosure is surrounded by stone and brick defensive walls, many of which still stand.
Bernabò Visconti, the lord of Milan, ordered the castle built between 1370 and 1377 on a site previously used by Celtic and Lombard communities. Over the 15th century, control of the site changed hands several times, the structure was partly demolished, and it gradually lost its military role.
The castle was built to control river crossings and trade along the Adda, and its position on the rock above the water still makes that purpose clear. Walking through the remains, visitors can read the logic of medieval power in the way the walls and tower face the river below.
The path to the fortress has uneven ground, so sturdy footwear is a good idea. The tower staircase is steep and narrow, so it suits visitors who are comfortable with heights and confined spaces.
A fortified bridge with a single arch spanning 72 meters (236 feet) once connected the castle to the far bank, making it one of the longest single-arch bridges in medieval Europe. It was destroyed in 1416 and now survives only in historical records and traces found during excavations.
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