The main part of the St Nicholas Church is of local Old Red Sandstone, with a three-stage tower. The spire can be seen for several miles around.
A church on this site, probably a wooden structure, was endowed by Ffernfael ap Ithel and Meurig ap Tewdrig who were rulers of Gwent in the 7th and 8th centuries. The Preaching Cross in the churchyard may date back to this time, as may the font. The present building dates from the 13th or early 14th century. The early English Gothic stonework has been dated to between 1225 and 1272, and that of the Decorated Gothic up to 1350. The church has a large clerestoried nave, with a much smaller chancel. The interior has a spendidly high tower arch, and the five-bay nave has arcades on octagonal piers.
The altar rails and pulpit, dated 1640, are survivals of 17th century church interior design. At the west end of the church, directly below the window, is a Royal Coat of Arms for King Charles II dated 1683. Records are held by the church dating from 1692. Complete lists of vicars, from 1359, and churchwardens, from 1763, can be found in the entrance to the south aisle.
When the weathercock was removed from the spire in 1972 it was found to have been made in Ross-on-Wye in 1792. The original spire fell, damaging the roof of the nave, and a contemporary reference attributes this to 'lightning and storms'. In the belfry the cage housing the three bells is of a type similar to that found in others constructed about the year 1700. At the end of the last century the church was in a neglected state and was extensively renovated and re-roofed. The Belgian slates then in place were replaced with Welsh slates in 1961. The chancel was replastered in 1972 and painted white. During 1974 considerable repairs were undertaken to the north and south aisles, and in 2001 the majority of the churchyard dry-stone wall was removed and rebuilt.
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.