The Château de Luc was built in the 12th century on a previous Celtic site. The castle, as a strategic point between the two provinces of Gévaudan and Vivarais, guarded a link to the south of France of the Auvergne frequently used by pilgrims of Saint Gilles, also known as the Regordane Way, on which it was a toll-gate.
For the first 100 years or so of its existence it was the home of the Luc family. In the 13th century it became the property of other regional seigneurs. During the Hundred Years' War it withstood a number of sieges. During the 16th century Wars of Religion the state of Gévaudan garrisoned the castle. Around 1630 the castle was dismantled under orders of Richelieu. During the period surrounding the French Revolution it continued to fall apart from neglect.
It remains in ruins today and attracts hikers who re-trace Stevenson's route on the GR 70.
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.