The oldest parts of the Medelplana church date from the 1100s, with the tower added in the 1300s and the choir and armory coming later. At one time the church may have been dedicated to St. Helena (Elin) of Skövde and Götene. What is believed to be St. Helena's altar is currently the baptismal altar. In the village as it was in the middle ages, there was also a St. Helena's spring, which was later excavated and restored. It is situated by the road just north of the church.
Inside the south door stand two well-preserved lily stones from the 1100s. A gap where stairs used to be is on the church's north side, and an old box for contributions to the poor also is found there.
In 1611 the Danes were devastating the area, and among other deeds they burned the town of Skara. In Medelplana there was a pastor by the name of Jonas Andersson Grodt, and when he heard stories about how the Danes were causing havoc, he collected his own silver items and presumably the church's silver collection. According to a registry drawn up prior to the disappearance, the collection consisted of two silver goblets and a box made of silver for consecration wafers. He went off to the east from the parsonage in Medelplana, away to a little brook that flowed past the pastor's cottage at Kollängen. There he dug down and buried all the silver, so as to hide it from the Danes if they should come. Grodt died almost immediately thereafter, without revealing where he had hidden the silver treasure.
Many people have searched the treasury, but until now no one has found it. It is also thought that it may have been found and perhaps melted down, or that the entire story is a fabrication. The legend-encrusted silver treasure still sits brooding on its secret. It may be that some time in the future it will be discovered.
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.