St Michael and All Angels is said to have been built in 1111. The earliest mention of this parish church comes in the form of an 1141 confirmation of a donation made to the church by Maurice de Londres. The church and all of its possessions were given to the Abbey of Gloucester; this was confirmed circa 1200 when the Bishop of Landaff assigned a resident chaplain to the church. In 1254, the church was listed with a valuation of five marks. By 1291, it was combined with the valuation of Ewenny Priory.
The church has many medieval wall paintings. Traces remain on the west wall of the chancel arch, depicting the consecration of St. Nicholas, Bishop of Myra and the story of the young mother who left her baby in the bathtub to attend the service and whose baby was miraculously saved from death by boiling while his mother attended the bishop's consecration. Other subjects are interpreted as St. Vitus and the Enthronement of Thomas Becket. The building was restored in 1879. New windows were inserted in the nave, the old stone pulpit was replaced by an oak one and a new oak communion table, lectern and chancel furniture were installed. Many of the church's furnishings date from this time. The wall paintings are reckoned to be 600 years old and are painted in tempura on a fine lime plaster.
After the Reformation, when a wooden holy table was often substituted for the original stone altar table, the stone altar of St Michael's was thrown into the churchyard and lies on the south side of the churchyard at right angles to the gravestones. The Pre-Reformation bell which the square medieval tower with its battlement was built to carry has survived with its Latin inscription “Sancte Michael ora pro nobis” (Pray for us St Michael), invoking the saint to which to church is dedicated. There were originally 3 bells in the tower but two were broken and the metal sold in 1722 to pay for the reseating of the church.
In 1971, the church was damaged by a fire. To prepare for the 2000 Millennium, the church was redecorated and reroofed; a new north vestry and entrance were also part of this project.
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.