Frankenstein Castle is a medieval fortification on a spur above the village of Frankenstein. The name first appeared in a document of 1146 mentioning the free nobleman Helenger of Frankenstein. But the beginning of the castle is assumed to be at an earlier date because the erection of a defensive tower around 1100 is reported in various documents.
The tower belonged to nearby Limburg Abbey in charge of security on the road to Speyer, Dürkheim und Worms. In 1205, the monastery commissioned the counts of Leiningen with this task. The counts had the tower expanded to a castle in the beginning of the 13th. century.
From 1204 to 1231, documents mention the knights Marquard, Friedrich and Helenger von Frankenstein as administrators in charge of the castle. Around 1390 Frankenstein Castle became a joint heritage castle when Limburg Abbey pledged half of the castle to the Lords of Einselthum. A part of this pledge was taken over by the counts of Nassau -Saarbrücken and Leiningen-Hardenburg in the beginning of the 15th. century.
In the second half of the 15th. century the castle was damaged in the struggles between Prince-elector Frederick I and Count Palatine Ludwig I of Zweibrücken. The castle suffered further damage, presumably in 1512, when the Count of Nassau conquered it on orders of emperor Maximilian I. During the German Peasants' War the castle was destroyed and was considered uninhabitable as of 1560. Nevertheless it served military purposes because of its strategic position.
In the Thirty Years' War the Spanish General Ambrosio Spinola captured the castle. In the War of the Spanish Succession it was used to accommodate French troops. It is confirmed that these troops still used the castle chapel for mass in 1703.
In 1706, the Electoral Palatinate took possession of the Nassau-Saarbrücken share of the castle.
After the Palatinate had become part of Bavaria, the ruins of the castle were secured in 1883–84. Another upgrading took place in 1938–39.
Today the castle is owned by the state of Rhineland-Palatinate. In the 1970s and 1980s some parts oft the castle were restored and foundations of a previously unknown shield wall were unearthed.
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.