With medieval characteristics, Caminha castle was built on military foundations of the 4th and 5th centuries. The defences were reinforced and expanded during the Christian Reconquest. During conflicts with Castile, its settlement and defense were encouraged under the reigns of King Afonso III (1248-1279), King Denis (1279-1325) and John I (1385-1433), due to the strategic value that this lindeira town represented for the kingdom.
With the closure of the 1383-85 Portuguese interregnum crisis, the village supported John. The new King John I helped the village and garrisoned by a second line of walls. Under the reign of King Manuel I (1495-1521), the town and its castle are recorded in drawings by Duarte de Armas in his Book of Fortresses, c. 1509.
The current Clock Tower (Torre do Relógio) would be the most important and robust building of the fortified ensemble, originally constituted as the Keep, with a quadrangular shape and an inscription of regal arms stone. Since the beginning of the 17th century it houses the village clock, the bell dating from 1610, and since the Restoration War it bears a stone image of Our Lady of Conception.
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.