A medieval fortress in Dobersberg first appeared around 1305. The present-day castle can be seen as its successor and was constructed by Sigmund von Puchheim around 1520. However, his heirs had to sell the property in 1588 to Johann Ambros Brassican, who bequeathed it to his daughter Anna Sabina, married to Christoph Adam Fernberger.
During the Thirty Years' War, the castle was plundered by Bohemian troops.
In 1645, the imperial colonel Johann Ernst Freiherr von Montrichier purchased the estate from the Fernbergers, and in 1673, it came into the possession of Peter Freiherr von Ugate. In 1678, the Herberstein family acquired the castle and the estate. At the end of the 18th century, the Herberstein family sold all their properties in the Waldviertel region, including Schloss Dobersberg.
A new owner, Sebastian Edler von Güldenstein, emerged but leased the property. It wasn't until Philipp Ferdinand Graf von Grünne acquired Dobersberg in 1802 that the castle experienced a resurgence. He carried out extensive renovations and created a castle garden in the following years.
After the death of Philipp III. Graf von Grünne, the castle first passed to his mother and eventually to his nephew, Graf Friedrich von Szápáry.
In 1945, the castle was heavily damaged and suffered further during the subsequent years of Russian occupation. For example, the entire neoclassical interior was lost. In 1948, the municipality of Dobersberg purchased the building and began renovating it in 1972. Today, the premises house the municipal office and a natural history museum.
Schloss Dobersberg is a three-story, compact four-winged structure. The exterior corners and the center of the west side of the castle are adorned with round towers with curved cone roofs, while the southeast corner has a square tower with an onion dome. Originally, this tower had a gallery with a gabled roof, but during renovations in 1805, the current onion dome was constructed.
References:Towering 52 meters above the sea, Bengtskär lighthouse is the tallest one in Scandinavia. The building started in in 1905 after the shipwreck of S/S Helsingfors and was completed in 1906. The lighthouse was designed by architect Florentin Granholm. On December a special petrol lantern, designed and built in Paris, was brought to Bengtskär and installed atop the tower.
German fleet bombarded Bengstkär in the First World War in 1914. Since the Gulf of Finland was heavily mined, it was not until 1919 that the surrounding seas were declared safe for shipping, that the light was lit again.
After the war the military value of Bengtskär increased as part of the defence system of independent Finland. In Second World War (1941) Soviet Union made a suprise attack to island. After a bloody battle, the small Finnish garrison emerged victorious. Intermittent repairs to the facility continued during the post-war period.