The Matterhorn, from my hotel window in Zermatt, Switzerland!
I think I'm with you on this. Last May we stayed at AKV in a 2 bedroom villa. We were in a sweet spot as there were animals all the time(previous stays had been less impressive.) The balcony ran the full length of the two rooms so it was roomy and comfortable.Although we've stayed a much nicer hotels (no way are WDW deluxe actual 4-stars), I have to grudgingly admit nothing has ever compared to opening the drapes at AKL and feeling like I was eye-to-eye with a couple of giraffes.
Swissôtel in Chicago with a view of both the Chicago River and Lake Michigan.