Tomba dei giganti di Li Lolghi is a burial chamber which probably dates back to the period included between 1800-1200 BCE. Like the tomb of Coddu Vecchiu, it was built in two different phases for different uses: during the Nuragic Age the original Dolmen, high a bit less than 4m and probably belonging to the Bonannaro's culture, was linked to a 10m corridor made up by stones stuck in the ground vertically. This new passageway was the new burial chamber where the dead used to be put in through a small entrance at the bottom of the Dolmen.
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.