The Emperor William Monument (Kaiser-Wilhelm-Denkmal), near the town of Porta Westfalica, was erected to honour the first German Emperor, William I (1797–1888), by the then Prussian Province of Westphalia between 1892 and 1896 and emerged against the background of a rising German national identity. The monument, which is around 88 metres high, is classified as one of Germany's national monuments.
The architect of this prominent monument was Bruno Schmitz and the sculptor was Kaspar von Zumbusch. Since 2008, the monument has formed part of the Road of Monuments. As a result of its dominant geographical site, it is the most important landmark of the town of Porta Westfalica and of northern East Westphalia.
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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.