Santi Primo e Feliciano church at the site is documented since the 12th century. It belonged to a college of canons regular who in 1354, became members of the Congregation of Servants of Mary, and so remained till the 18th century. The convent was suppressed in 1810.
The original structure had three naves, but in the 15th century an additional nave was added. In the 16th century, the church was reduced to a single nave, with demolition of the prior apse. The facade was restored in 1940.
The first chapel on the right has a Virgin and child with Blessed Bertoni and St John the Baptist (1498) by Agostino da Vaprio. The superior lunette has a fresco depicting God the Father. The transept has a large canvas depicting the Martyrdom of St Lawrence by Marcantonio Pellini (1664-1760). The presbytery has two lateral frescoes depicting the Life of Saints Primo and Feliciano (1860) by Bardotti. They depict The Trial of the Saints on the left, and Martyrdom of the Saints, on the right. The first chapel on the left has a Crucifixion with St Pellegrino by Sabbadini.
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.