St Michael and All Angels stands outside the village of Castlemartin, adjacent to two holy wells which may indicate the site held religious significance in pre-historic times. A cross, dating from the 7th–9th centuries, was discovered embedded in the church wall in 1922, but has subsequently been lost. The main body of the current building dates from the 13th century, although the centrally-placed tower is later, of the 14th or 15th centuries. The church was restored, firstly in the early 19th century, and again in 1858.
The church has some notable Victorian stained glass from the studios of Hardman & Co. and Heaton, Butler and Bayne. A Hardman window of the Crucifixion, to a design by Augustus Pugin, has been described as the best example of Pugin's work of any church in Wales. The church contains a First World War memorial commemorating three men from Castlemartin who were killed in the conflict. The church was declared redundant in the early 21st century and is now in the care of the Friends of Friendless Churches.
St Michael's is a Grade I listed building. The adjacent vicarage, now derelict, and a mounting block in the churchyard have their own listings.
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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.