The Piarist Church, also known as the Church of Maria Treu, is a Baroque parish church of the Order of the Piarists in Vienna. The church has eight chapels and is decorated with frescoes made by Franz Anton Maulbertsch in 1752–53. Commissioned by the Piarists, Haydn’s Missa in Tempore Belli (Mass in Time of War, sometimes known as Kettledrum Mass) was first performed here on 26 December 1796. The Piaristenkirche was elevated to the rank of Basilica Minor in 1949.
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.