The Arenberg site had been the castle of the lords of Heverlee since the 12th century, but this family became impoverished and had to sell the site in 1445 to the Croÿ family from Picardy. Antoon van Croy demolished the medieval castle and started works to build the current château in 1455 on the site, of which he destroyed all but one tower. Willem van Croÿ completed the works on the château in 1515, and founded a monastery on the château grounds for the Benedictine Celestines. The architectural style is in large part traditionally Flemish, with sandstone window frames and brick walls, though it has been structurally altered since 1515 and has elements of Gothic, Renaissance and Neo Gothic architecture. Its large corner towers are typical, once surmounted by a German eagle.
Charles III of Croy was the 4th and last duke, and after his death in 1612 without issue the château passed to the Arenberg family into which his sister had married, and remained in that family until the First World War.
During the First World War, the château and grounds were occupied by the Germans and Austrians. The château and park were seized by the Belgian government on the outbreak of, and then after the war since the Arenberg family was considered to be German or Austrian due to their close Habsburg connection, monarchs of Austria-Hungary. It took until 1921 for the University to acquire them, becoming an expanded natural sciences and engineering campus in the style of that of an American university. After the partitioning of the university along language lines in 1968, the château and grounds remained with the Dutch speaking half as one of the main campuses for the new, independent Katholieke Universiteit Leuven. The château itself is the main building of the Faculty of Engineering and houses lecture rooms and studios for the Department of Architecture, Urbanism and Urban Planning, including the Post-Graduate Centre Human Settlements and the Raymond Lemaire International Centre for Conservation. The building is open to the public. The former Celestine monastery on the château grounds now houses the campus library, and the addresses of many of the science buildings are on the street named Celestijnenlaan (Dutch for 'Celestine Street').
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.