The Katskhi pillar is a natural limestone monolith. It is approximately 40 metres high, and overlooks the small river valley of Katskhura.
The rock, with visible church ruins on a top surface measuring c. 150 m2, has been venerated by locals as the Pillar of Life and a symbol of the True Cross, and has become surrounded by legends. It remained unclimbed by researchers and unsurveyed until 1944 and was more systematically studied from 1999 to 2009. These studies determined the ruins were of an early medieval hermitage dating from the 9th or 10th century. A Georgian inscription paleographically dated to the 13th century suggests that the hermitage was still extant at that time. Religious activity associated with the pillar was revived in the 1990s and the monastery building had been restored.
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.