In 1009 Herswithehusen (Hardehausen) became the property of Meinwerk, bishop of Paderborn. The abbey was founded in 1140 by bishop Bernhard I of Paderborn as a daughter house of Kamp Abbey on the Lower Rhine. Construction was completed with the dedication of the church in 1165.
During the Thirty Years' War the abbey was looted and destroyed. During its reconstruction in the years 1680 to 1750 it received its present form.
In 1803 the abbey was secularised, and the monks expelled. The contents were sold or auctioned, and the church was demolished in 1812. The estates were rented out as state property.
Hardehausen was briefly re-founded as a Cistercian monastery in 1927, but the new community was brought to an end by an order of dissolution issued by the National Socialist government in 1938, when the buildings and grounds were sold to the Henschel company from Kassel, from whom they were acquired by the Verein für katholische Arbeiterkolonien ('Union for Catholic Workers' Colonies'). In 1944 the Nationalpolitische Erziehungsanstalt (Napola) Bensberg transferred to Hardehausen. At this period an external work party from Buchenwald concentration camp, consisting of 30 prisoners, were deployed for forced labour in Hardehausen.
Since 1945 the former monastery has been used for the educational activities of the present Archdiocese of Paderborn. In 1970 all the buildings on the site were altered and extended for their educational functions.
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.