The Nidaros cathedral is the most famous and honoured cathedral of Norway. It is built over the grave of St. Olav who is considered to be the first Christian of Norway. Work on the cathedral began in 1035 and was completed in the 1300’s. Its famous facade is decorated with statues, ornaments and the signature rose window. Make sure to visit this cathedral when you are in Trondheim, because this is the main highlight.