Theobald I ordered the construction of the Tiebas castle around 1250 and since then it has suffered throughout history.
It survived numerous attacks quite well until an attack by Castile in 1378 ended with it on fire. With it, burned a good part of the Navarre Archive, and this has deprived us of a lot of information about our history.
Luckily, in 1512, it managed not be demolished under Cardinal Cisneros. Then it witnessed a bloody battle in 1810 between four battalions under Espoz y Mina against more than 3,000 French soldiers.
In the end, after being abandoned, many of the stones were taken from the castle, and work is being done now to consolidate the structure.
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.