Albegno Castle, Medieval castle in Treviolo, Italy.

Albegno Castle, also called Treviolo or Solza Castle, is a ruined castle in Treviolo. What remains is a tower, an entrance with traces of a drawbridge, and a wall circuit of cobblestones laid in herringbone pattern, with brick reinforcing the stone corners of the tower. Parts of the building are now a private dwelling, with modified windows and entrance.

The castle may have existed as early as the 11th century and is cited in 12th-century documents, when the Ghibelline Suardi family occupied the village. In 1405 the feud with the Guelph Colleoni turned violent, destroying many buildings and killing many inhabitants; only Venetian rule from 1428 restored balance among Bergamo's families. After the Peace of Ferrara the castle passed to the Solza family, who held it until the early 19th century.

The castle is now a private dwelling, so its windows and entrance have been altered from the medieval original. The name Albegno comes from the village of the same name in Treviolo, and the site is also called the Solza castle after the family that held it until the early 19th century.

The site is accessible but privately owned, so it is best to check ahead for visiting options before planning a trip. Daytime visits work best for seeing the ruins and their architectural details clearly.

The castle is now a private dwelling, so its windows and the very accessible entrance have been altered from the medieval original. What survives of the original fabric is the tower, the entrance with traces of the drawbridge, and the curtain wall of herringbone-laid cobblestones, with small bricks reinforcing the stone corner quoins of the tower.