Aurora Borealis/Northern lights

You should, it is amazing. One of the world’s most beautiful sights.  Actually, you can see them all year around, but the sun often cancels them out in the summer, so the best time is between September and March.  For the Northern lights, you should head up to Svalbard in Norway, Northern Canada, Kakslauttanen in Finland, Jukkasjärvi in Sweden and Reykjavik in Iceland. If you happen to be in the UK, you could go to Scotland and Ireland to see them too.