The northern lights - Aurora Borealis - is one of the most famous natural phenomenon, appearing as mainly twisted greenish ribbons and streaks that light up the dark sky. Unfortunately, this display of the beauty of nature occurs only on very northern (and also southern - southern lights) latitudes and thus it is quite difficult to spot. Apart from getting to the remote places where Aurora Borealis can be found, one has to be really lucky not only with the solar activity but also with the weather.
It was always one of my biggest dreams to be able to admire this wonder in real life, and during my very short stay in Iceland, although the solar activity was low and the weather quite unpredictable, I managed to see it.
What Are the Northern Lights and Why Do They Occur

Northern lights in Iceland Tomasz Lisowski, Adventurous Travels