Sweden is mostly visited by tourists from its neighbouring countries Denmark, Norway and Finland. Thereafter follow tourists from Germany and the United Kingdom. A popular route for German tourists is to go by train from southern Sweden, through the European routes, up to Sweden's northern parts. Attractions along the way are historical, natural and cultural. According to the CIA World Factbook, Sweden is the 21st most visited country in the world, with 7,627,000 arrivals in 2006.