BKK-ZRH I flew once around 7000m/21000 ft with a Swissair M11 and there was a great view over canyons and everything... It was around 1998 I think.
KIX-ZRH also on a Swissair M11. The flight left around noon and it looked like the plane was hunting the sun, it is always in front of you and there was a nice view over Siberia.
Flew HNL-MAJ-KWJ-KSA-PNI-TKK-GUM two weeks ago and wasn't that bad too. 5 different Islands in less than 14h
Flights from Europe to ATL, MIA, PHL, IAD etc. used to fly over BOS and NYC and I have seen Manhattan several times, during night and day.
ZRH-KUL on MAS 772 I have seen several cities like KHI, THR etc. in the night with a clear star sky. Wonderful, was even seating with my gf in the cockpit
Sorry, one short-haul I have. Flew yesterday ZRH-GVA-ZRH and on both ways I saw the Swiss National Exhibition (EXPO 02) from around 4500m (13'500ft). I like the ZRH-GVA flight, it is short, below 30min, but if you see all cities as Zurich, Baden, Bern, Fribourg, Lausanne, Geneva and the Alps in the background. Thats one of the few moments I don't feel this strong need to travel around in far countries, mostly in Asia...
cheers, have fun, I do