Rovaniemi is the capital of Finnish Lapland.
Razed to the ground by the Germans in the final days of World War II in 1944, today's Rovaniemi is a featureless expanse of concrete blocks, albeit one built on a slightly whimsical city plan intentionally shaped like reindeer antlers.
Rovaniemi Airport (RVN) is the largest in northern Finland and also fields a limited number of international flights, mostly to northern Russian destinations like Murmansk. There are also direct charters during Christmastime.
Rovaniemi is the terminus of most trains from the south. The journey from Helsinki takes 9-12 hours and is reasonably comfortable in a sleeper. You can also take your car with you.