Schachenstein Castle was the last hill castle to be built in the Styria. It was built in 1464 by Abbot John II Schachner of Lambrecht as a summer residence and lordly manor. It was extended in 1630 and 1740. From the end of the 18th century the castle lost its significance and fell into ruins.
The main purpose of the fortification was as a home and summer residence of the abbots of St. Lambrecht's Abbey as evinced by a large number of historic records. Subsequently, it was used to seal off the Mariazell road and protect the population of the Aflenz valley - who were looked after by the abbey - as well as providing a refuge during Turkish and Hungarian invasions.
The site of castle was an outstanding choice: some 640 above sea level on rocks forming the southern spur of the Schöckelberg. It is situated on an easily defended constriction of the road from Einodgräben to Mariazell, which was originally also guarded by a fortified gateway.
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.