Built into the side of a limestone cliff, the St. Govan's Chapel measures 6.1 m × 3.7 m with walls constructed from limestone, and consists of two chambers, one in the front and one in the back. The majority of the chapel was built in the thirteenth century, although parts of it may date back further to the sixth century when Saint Govan, a monk moved into a cave located on the site of the chapel. One legend suggests that Saint Govan is buried underneath the chapel's altar, located at the east end of the building. The entrance to the building is via. a doorway on the north side, low stone benches run along the north and south walls and an empty bell-cote is located at the west end. The slate roof is suspected to be a modern addition compared to the rest of the building.
The building is accessible from the clifftop by climbing down a set of 52 stairs, although tourist organisations propagate the legend that when counted, the number of steps differs between going down and going back up.
The building was listed with Grade I status on August 2, 1996. The chapel is within the Castlemartin Military Training Area and is sometimes inaccessible.
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.