St Decuman's Church is on a very early Christian site and is dedicated to Saint Decuman. It was the 'bishop-house' of the cantref of Penfro and one of the seven principal churches in Dyfed under medieval Welsh law. It is constructed of rubble stone under a slate roof which carries a bellcote. The nave and chancel are possibly 13th century and the transept, chapel and tower 14th century.
The font, in the north porch, is 12th or 13th century; the nave has a small Norman font. The church contains a number of tombs and memorials, including two recesses and wall-mounted coffin lids. The oldest dated memorial is a 1716 baroque monument to F Powell of Greenhill. The pulpit and lectern are 19th century, and windows range from the 19th and 20th centuries, as recently as 1960.
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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.