The castell de Montclús was built between the 11th and 12th centuries on top of an earlier structure. In the 14th century, it was converted into a palace, and in 1508, the capella de Santa Margarida was restored.
The castle comprises two distinct enclosures: the lower one, of which remains of the perimeter survive, and the upper one, with well-defined perimeter walls and a notable cylindrical tower with a sloping base. This upper enclosure has a square layout, shaped by successive modifications, and retains three of its original four walls.
Inside, the space is organised around a central courtyard dominated by the main tower, with rooms arranged around it. The north-west tower stands out for its two-storey structure. In the lower enclosure lie the remains of the capella de Santa Margarida, with a single nave and semicircular apse.
The castle was under the Montseny lineage from the 11th century and, between 1230 and 1263, passed to Guillem de Sesagudes, who adopted the surname Montclús. In 1275, it was transferred to Ramon de Cabrera and, in 1403, it became independent from the orde de l’Hospital de Sant Celoni.
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