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Pro Long viewing season
Finland has a long viewing season for the lights, stretching from August-April.
Pro View the Northern Lights from a glass igloo
The Kakslauttanen Arctic Resort offers a unique way to view the Northern Lights. Glass igloos (which include a toilet and bed) let you sleep under the lights with a full view of the sky.
Con Expensive accommodations
There aren't many hostels, so it can be difficult for backpackers and budget travelers to find affordable accommodations. However, there is a fairly active community on both Couchsurfing and AirBnB.