The Haga dolmen (Hagadösen) is a megalithic dolmen, dating from the Neolithic era. It is located on the island of Orust in Bohuslän, about one kilometre to the east of Tegneby Church. Not far from the dolmen is a second, smaller one, and about 250 metres west of it a large passage grave can be found.
The grave consists of four raised stone slabs, with a fifth slab placed as a roof, with an additional threshold stone by the entry and a stepping stone. It is surrounded by a small mound of earth, and some barely visible edge stones. While small in size, the dolmen has the province's largest inside chamber. It has a rough dating of about 3400 BCE.
Several artefacts were found during an archaeological excavation in 1915 by Arvid Enqvist, among them an amber necklace, a stone axe, a flint knife, and some slate jewellery. These finds were dated to the late Neolithic. No grave finds from the dolmen's primary period, the early Neolithic, have been discovered. The neighbouring dolmen was also excavated at this time.
References: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.