Château de Glénay, with its origins in the 12th century, began as a fortified house overseeing the Thouaret River. Over time, it transformed into a castle, witnessing various modifications and restorations, particularly after the Hundred Years' War and the Wars of Religion. Occupied by notable families, including the Vignerot de Pontcourlays, who later became Dukes of Richelieu, the castle saw visits from historical figures like Cardinal de Richelieu and Henri de La Trémoille.
Post the 17th century, ownership changed hands, leading to periods of neglect and repurposing. After the French Revolution, the castle became an agricultural estate, and the once-grand residence succumbed to nature. However, it gained historical recognition and protection in the 20th century, ensuring its preservation.
Currently a private estate, the Château de Glénay is undergoing a meticulous restoration project since 2021, focusing on restoring its original features. The efforts aim to revive the castle's historical charm, showcasing its architectural and cultural significance.
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.