Norderhov church was originally built in c. 1170. It has been rebuilt and expanded into a cruciform church. The construction may be related to the establishment of the Diocese of Hamar in 1153. Norderhov Church has a recorded history dating to an announcement for Ringerike issued in 1298 by Duke Hakon Magnusson, who later became King Haakon V. The church is most known for it close connection with Anna Colbjørnsdatter and with the Skirmish at Norderhov.
The church was renovated in 1771, 1796 and 1809-1810. The sacristy was extended to the east and with new, larger windows and a new lower ceiling and a new choir loft in 1881-1882. Meanwhile, the tower spire was covered with copper plates and the church was refurbished. A new chapel was erected on the north side of the church in 1910-1912. The church was restored again in 1926 and 1953-1956.
The pulpit dates from 1582 is one of the oldest in Norway. The Baroque altarpiece was made probably by Johannes Larsen Skråstad in 1682.
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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.