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:Bomarsund fortress and garrison was built in 1832-1854 by Russian Empire to defence Åland Islands against enemies. British and French fleet attacked against it during the Crimean War in 1854. After a week of fighting the British stormed the remaining fort. Anglo-French forces destroyed it totally after battle. In the Treaty of Paris 1856, the entire Åland Islands were demilitarized, which is a status that has been preserved until this day.
Nowadays there are some ruins left and fortress area is open for visitors.