The Church of St Cadoc is medieval, of Old Red Sandstone with a stone tiled roof. The nave is quite long, ending in a battlemented tower and turret. The church was extensively restored in the nineteenth century, including work undertaken by John Prichard, following the collapse of the south wall.
The interior includes a large wall painting of the early fifteenth century depicting St George slaying the dragon. The Royal Commission on the Ancient and Historical Monuments of Wales describes a possible interpretation of the painting as being a reference to the defeat of Owain Glyndŵr by the English at the battles of Campston Hill (1404) and Grosmont (1405), which were fought near to Llangattock Lingoed.
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.