Engelstein Castle was first mentioned in 1417 but it is probably much older. It is probable that at first it was a simple watch tower, guarding a nearby road crossing, which was upgraded to a water castle after the destruction of Hadmarstein Castle on the nearby Johannisberg mountain at the end of the 13th century. It was situated on a granite cliff surrounded on 3 sides by small lakes.
In 1531 the castle went to Benedikt Schaul who started to transform the still medieval fortress into a Renaissance castle. The Barons of Windhag continued this elaborate reconstruction and gave the castle its present outlook. The costs however were so enormous that the barons were soon heavily indebted after which the castle was confiscated at the end of the 16th century.
In 1619 Engelstein Castle was stormed by Imperial troops and plundered. In 1681 it was bought by Adam Anton Graf Gundemann, whose descendants owned the castle for the next 150 years. Then it went to the Barons of Geusau who owned it until 1916.
Several other owners followed until it was acquired by the industrialist Erich Meinl in 1964. By then the castle was in a bad state due to being plundered and neglected during and after World War II. Now the bailey is inhabited by a descendant of Meinl.
At present Engelstein Castle is privately inhabited and can thus not be visited.
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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.