The Plasy Monastery was founded in 1144 by Duke Vladislav II as one of the oldest Cistercian monasteries in Bohemia. Monks from the Franconian Langheim settled Plasy. During the Hussites Wars in the first half of the 15th century buildings of the abbey were burnt out and almost all the goods were subsequently taken.
The monastery experienced a second period of prosperity after the Thirty Years‘ War: the baroque new buildings of the monastery, the large foursided courtyards and the pilgrimage church of Marianske Tynice are still characteristic of the landscape today – as are extensive agricultural areas for grain and fruit cultivation.
In 1826, the monastery building with the whole estate was purchased by Klemens von Metternich, who is buried in the Church of Saint Wenceslaus in the family tomb.
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.