The church was originally made of wood. The first stone walls were built between 1410 and 1420 and in about 1450 the church was expanded four meters towards east and six meters towards south. http://www.discoveringfinland.com/destination/porvoo-cathedral/

The Cathedral, by Carl Ludvig Engel, rising on the northern side of the Senate Square is the stage of national and academic festive services and one of the most popular tourist sights. http://www.visithelsinki.fi/en/see-and-experience/sights-and-attractions/helsinki-cathedral