Ruth's Church (Ruts Kirke) was built in the early 13th century in the Romanesque style. Situated on a hilltop 130 m above sea level, it is the island's highest-standing church. The oldest reference to the church dates from 1490 where Sancti Michelssogen (St Michael's Parish) is mentioned. The church was initially consecrated as St Michael's, possibly because of its high location. By 1621, the name had become Ruth's Church after Ruth the Moabite in the Old Testament.
The church was probably built first with a nave and chancel. The tower at the west end and the porch on the south side were added later. The chancel and the finely rounded apsis are part of the original structure. At the end of the 19th century, the north wing was added. The old tower and porch were removed a little later, the nave was lengthened by some 3 metres and a new tower was built.
Constructed in the second half of the 16th century, the bell tower in the churchyard is said to be the oldest on the island. It has not, however, been used since 1886 when the bells were transferred to the new tower at the west end of the church.
In 1908, frescoes were discovered in the late Gothic apsis vaults. Depicting the signs of the evangelists, they were restored in 1930. Next to the fresco of Matthew, the date 1559 can be seen. Also of interest is the granite Romanesque font which is almost cylindrical in shape.
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.