Arenfels Castle dates originally from the 13th century and was converted as Renaissance palace in the late 16th century. The castle got its current neo-Gothic appearance in 1849-1858. During the battles for Remagen Bridge in the Second World War, the building fabric was considerably damaged. Most of the war damage has been repaired today. The beautiful interiors of the castle have been restored, and the imposing cast-iron staircase from the Sayner ironworks is particularly worth seeing.Arenfels Castle, with its location in the middle of the vineyards, is a romantic venue for weddings, family celebrations and corporate events.
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.