The Santa Clara buildings were originally built by King Alfonso XI as his palace in 1344. His son Peter the Cruel had it embellished by Mudéjar artists, beautiful works at Santa Clara, though on a much smaller scale than they did in the Alcázar of Seville. The facade, a lovely small patio, a chapel and the baths remain of Peter the Cruel's palace. Blanche de Bourbon was held here after her abandonment by Peter for María de Padilla in 1353. The former portal, blocked off now, has a particularly fine Mudéjar doorway. In 1363 he ceded Santa Clara to two of his daughters by María de Padilla. They turned it into a convent, but it retained its role as a royal palace.
Santa Clara convent's saddest association is with Joanna I Queen of Castile and Aragon, the daughter of Isabella I of Castile and Ferdinand II of Aragon, widow of Philip I of Castile and mother of his six children including Charles V, Holy Roman Emperor - popularly known as Juana la loca (Joanna the mad) - who was confined here for almost half a century until her death in 1555.
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.