A medical emergency a few years ago on an AA LHR-LAX flight gave me an opportunity to stop in the most northern airport I have ever visited - Iqaluit. I'm not exactly sure what the emergency was, FA's asked for any available medical personnel and fairly soon after that they made a decision and we quickly descended for landing. Pax was offloaded - he appeared conscious so hopefully it worked out OK - but we had to stay for several hours while they went through some inspections and paperwork since we landed heavy. Later as I researched the "where the heck was I" question I got to learn about the relatively new Canadian territory of Nunavut.