So na Caçana dates from the Talayotic period (1000-700 B.C.) and remained occupied until the arrival of the Romans. It contains up to ten large structures. At first it was thought to be a settlement but archaeological excavation work uncovered up to three taula enclosures, which suggested it was more likely to have been a sanctuary and ceremonial site that may have been used by more than one community.The main features of the site are the central monument, the entrance to which was closed off in the 1st century B.C., and the taula enclosure on the west side. The capital of the taula has not survived, but you can see an unusual pilaster at the back. Also of interest are the niches in the perimeter wall. Archaeological excavation work inside the enclosure has uncovered evidence of the rituals carried out in this type of enclosure. There is also a necropolis in the area, comprising two natural caves and three underground burial chambers.
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.