Interesting pic. I was especially impressed with the city at 11k feet asl. I used to live at the Grand Canyon and fly from a base altitude of 6100 feet. Flagstaff is slightly over 7000 feet. The air is thin there. One time I had the pleasure of being in Equador and briefly visited the capital (Quito?) which was 9000 feet. That was very thin air. I can't imagine living at 11k!!!