The Diocesan Museum is located at the crypt of the cathedral where among the artefacts you'd find some other parts of the original altarpiece by the Master of Castelsardo.
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Castelsardo Cathedral
The cathedral is located at the northern edge of the medieval centre of Castelsardo, in a panoramic position overlooking the sea. The building blends the elements of the Catalan Gothic and the Renaissance. It was consecrated in 1622. The altarpiece contains a notable 15th-century painting Madonna con Bambino assisa in trono ("Enthroned Madonna and Child") attributed to the painter known as Master of Castelsardo.
This medieval church has no facade, the entrance is on the right side of the building.
The Town Hall since the year 1111.
Doria Castle
The castle is the major landmark of the town. Originally the castle was built by Doria family from Genoa in the 12th century. Later on the town was emerged on the slopes surrounding the castle.
The castle hosts the Mediterranean Weaving Museum.