Kiiu vassal stronghold, i.e. Kiiu Tower, is located in Kiiu Manor Park. It was erected in 1517 by Baron von Tiesenhausen and it is the smallest stronghold building in Estonia. There are four floors in the tower and from outside the stone wall is surrounded by a wooden circular balcony. The thickness of walls at the foot is 1.8 metres; the inner diameter is 4.3 metres.
The stronghold was destroyed during the Livonian War and it was restored under the leadership of art historian Villem Raam in 1974. Today a café is open in the citadel.
Reference: VisitEstonia
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.