Bardowie was the property of the Clan Galbraith from 1214, and passed by marriage to John Hamilton of Cadzow in the later 14th century. The tower was built in 1566, with additions made from the late 17th or early 18th century. The later part of the castle is dated 1713. In the mid 18th century the castle passed by marriage to Thomas Buchanan of Spittal-Leny, whose descendants owned the castle until the early 20th century. Thomas' son Dr. Francis Buchanan-Hamilton claimed the chiefship of Clan Buchanan. The castle was sold several times in the 20th century, including in 1912 and 1951.
In 2002, the property was owned by motivational speaker Jack Black, the founder of MindStore, who listed it for sale when he was unable to get a permit to operate his wife's software business from the property. The interior had been extensively modernized.
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.