if you have a good mesh addon, like fsglobal or the free-ware ones that are everywhere around,
just type in your airport search the words "grand canyon". You have to try in which of airport or city name it is.
From there you can look at your map, fly to the direction where the colour has so many different browns ,
and suddenly the ground is away!!!
It's no special scenery but really one of the best places of world where the mesh does it all.

-The Revelator