We went to Sweden and Norway in 2019 with Great Rail Journeys, an exceptional holiday. Started off in Stockholm before going North, mostly on the Inlandsbanan, a single track railway that runs right up the centre of the country. We went as far North as a town called Jokkmokk, north of the Arctic Circle. Most of the holiday, though, was in Norway, a beautiful country. There was a great deal more of Sweden to see than we managed but I can guarantee that you would see a great many trees! Very expensive, though.