Montalto Dora Castle was built in the first half of the 12th century on top of Monte Crovero reflecting in the waters of Lake Pistono, being first mentioned under the name of castrum monsalti in a document dating from 1140.
During the 14th and 15th century, the castle was modified and enlarged to better serve from a defensive viewpoint.
In the 19th century, the castle was renovated under the direction of architects Carlo Nigra and Alfredo d'Andrade, who also used it as a model and source of inspiration when designing the Borgo Medioevale in Turin.
In 1963 the Castle became property of the Allioni of Brondello family. From 1965 to 1985 they proceeded to restore the buildings inside the walls, and to enhance the park.In the last years, the current owners have gone on completing a functional restoration of internal and external spaces, along with several enhancing works for the whole park and its vegetation.
References:Carlsten is a stone fortress built on the orders of King Carl X of Sweden following the Treaty of Roskilde, 1658 to protect the newly acquired province of Bohuslän from hostile attacks. The site of Marstrand was chosen because of its location and its access to an ice free port. Initially a square stone tower was constructed, but by 1680 it was reconstructed and replaced by a round shaped tower. Successive additions to the fortress were carried out, by the inmates sentenced to hard labour, until 1860 when it was reported finished. The fortress was decommissioned as a permanent defense installation in 1882, but remained in military use until the early 1990s.
The fortress was attacked and sieged twice falling into enemy hands. In 1677 it was conquered by Ulrik Frederick Gyldenløve, the Danish military commander in Norway and in 1719 by the Norwegian Vice-Admiral Tordenskjold. At both occasions the fortress was returned to Swedish control through negotiations and treaties.