Best places to see the northern lights: Aurora borealis
NASA/U.S. Air Force, Senior Airman Joshua Strang
Of course Iceland is the best choice to see it. There are endless other nature pearls you can look at while you wait for the lights to show up. Check out more here: http://www.northernlightsiceland.com/
I believe the article does specify the lower 48. I've always believed contiguous means just that.
Depending on conditions and visibility, the aurora borealis can be seen as far south as the northern contiguous United States.
Thanks for pointing this out, but I think the wording was changed 'after' I made the comment. I'm perfectly aware of what contiguous means.