The Kirna estate was given as a gift to the von Fersen family in 1614 and remained in the ownership for over a hundred years. After 1787, it belonged to various Baltic German and Russian families from the nobility. After 1919 it was used as a school up until World War II. During the Soviet occupation of Estonia, the manor housed the offices of a collective farm. Today it stands in private ownership and is used for it's energetically propitious place as spa.
The building received its present appearance during a neoclassical reconstruction of an earlier building around 1820. The hall and other ceremonial rooms on the main floor was at that time also decorated with typical stucco ornaments. Some later additions were in a neo-Gothic style. The family cemetery of the von Osten-Sacken family together with the ruins of a funeral chapel reminding one of an antique temple are located near the centre of the estate.
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.