Tromøy church was originally a Romanesque stone church built around 1150. The church was reconstructed to a cruciform church between 1748-1758, and today this fabulous church is one of Arendal's oldest sights. The church is an old seamark, and due to the unsheltered location, the church is without a tower. The interior of Tromøy church is beautiful. There are wood carvings and painted interior from the 1750s, restored in 1926-1939. Several details in the church are worth mentioning, like the baptismal font made of soapstone from the 14th century, and candlesticks made of brass from 1660.
Important people were buried inside the church in the Middle Ages, both in the choir and in the nave. The tombs had large gravestones in the church floor. It has been illegal to bury people inside the church since 1805, and the large gravestones were moved outside during the restoration in the 1750s. They are now visible along the churchyard wall in the west, together with boulders from Tromøy.
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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.