Visconti Castle, Medieval castle in Cassano d'Adda, Italy

Visconti Castle stands on a rise above the Muzza canal near its junction with the Adda River. Its walls mix Adda river pebbles with brick courses, and tall brick buttresses built by Bartolomeo Gadio for Francesco Sforza descend toward the canal. The courtyard has pointed arches, and the west facades keep their original mullioned windows.

The fortress was built before the 14th century, but Bernabò Visconti greatly expanded it between 1355 and 1370. This expansion aimed to strengthen control over the Adda River region and secure the important passage.

The castle owes its alternative name, Borromeo Castle, to the Borromeo family, who owned it after the d'Adda. In the 20th century, restoration uncovered medieval frescoes on the walls and vaulted ceilings, some commissioned by Bernabò Visconti and his wife Regina della Scala. They can be seen in the interior rooms, now part of the hotel.

Today it operates as Hotel Castello Visconteo, providing lodging while allowing access to historical sections. Visitors can explore different areas of the building and view the structure from various angles along the river.

Architect Bartolomeo Gadio recorded detailed documentation of modifications made during the Sforza period. His records offer insights into 15th-century construction methods and how the structure evolved over time.