Although I'm a bit biased (I'm a Finn), I would still suggest people to go watch the northern lights in north Finland, Lapland.
I've spent most of my life living in Oulu, and even though Oulu is not all the way up north, we are treated every year with a magnificent display of Northern Lights. The more up north you go, the chances of seeing increase. Rovaniemi is the capital of Lapland so check for flights to there.
Since the lights occur during the night, there are hotels in Lapland which will offer wakeup calls for people wanting to see them.

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