I'm at the hotel after a 15 hour flight from Atlanta to Incheon. So far, I haven't really seen anything other than the airport and the hotel, The Hyatt Regency Incheon. http://english.hyattregencyincheon.com/
I flew on a direct flight from Atlanta... over 15 hours of flight time, which is currently Delta's longest non-stop. Three meals were served, I watched three movies, and I also slept lots. The route took us west and north of Alaska, then south over Russia.