High Quality Content by WIKIPEDIA articles! Helsinki Cathedral is an Evangelical Lutheran cathedral of the Diocese of Helsinki, located in the centre of Helsinki, Finland. The church was originally built as a tribute to the Grand Duke, Nicholas I, the Tsar of Russia and until the independence of Finland in 1917, it was called St. Nicholas' Church.The Helsinki Cathedral at night.Market Square, Helsinki. Helsinki Cathedral is in the center of the image.Helsinki Lutheran Chathedral and the statue of Emperor Alexander II of Russia.A distinct landmark in the scenery of central Helsinki, with a tall green dome surrounded by four smaller domes, the church was built in 1830 1852, in neoclassical style. It was designed by Carl Ludvig Engel, to form the climax of the whole Senate Square laid out by Engel, surrounded by a number of buildings all designed by him.