Storm Peaks for one reason and one reason alone: the music. Wrath did a lot of things wrong, but if you ask me, among the things it did absolutely right was the music. Storm Peaks--or, as I think it's called on the soundtrack, Mountains of Thunder--is the absolute best example of that.
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My favor zone is Mulgore i like the natur and my favor part is the Thunder Bluff it realy looks cool on the cliffs it's a realy good peace of art ; )
My favorite zone would have to be Uldum. The whole area gives a great Egyptian feel and the quests make u feel like you are really unearthing secrets from the past.
Vashj'ir is one of the most beautiful zones i have ever seen in WoW. My vote goes for it :) IT'S Underwater so thats biggest difference from all other zones :) would like to see some Raid action going there ;)
My favorite zone is Desolace pre-Cata. I remember struggling to get there on my ~30ish human mage - first character. Took a route through Dustwallow, Barrent, Thousand Needles and Feralas, because I did not know the game very well then. Although it was a barren demon-infested wasteland, it had it's unique mysterious aura, that kept me in the zone through all the quests and challanges, like killing the elite sea giants for mere satisfaction (and the 30 copper loot ofc) :)
Isle of Quel'Danas, is in my opinion, probably the most beautiful zone, that Blizzard created. Lorewise and musicwise, as I was always intrested in the Sin'Dorei, especially the Third War period. The music is one of a kind, and either questing or raiding inside The Sunwell, makes you feel like you're part of the history, which is being written right at that moment...Anu belore dela'na !
I would have to say my favorite was the original Western Plaguelands, not how it is now...The number 1 reason is almost everything! Back when level 60 was the limit, I had skinning and mining as my professions. You could always get the best leather and ore back then. The rep grind in the area was always fun times! You just need your commission and you can start collecting scourgestones for more reputation. As a matter of fact, I may some of those left in my bank getting eaten away with dust!When in the zone, my favorite thing was purchasing Arcane Quickener to gain some quick rep! Using drops to get rep is always fun imo. 8)
Grizzly Hills is my favourite, all of the wildlife and the trees, the entire zone is beautiful.
I like Silithus, because there is a lot of cool spot, and the raid instance there is one of the best looking one.
My favourite zone is for sure Hellfire Peninsulla, I liked it a lot because when you entered the dark portal, you probably won't have any idea of what you will be facing and why. And then you enter Hellfire Peninsulla, you see a constant war going on just in front of the portal, and you know: I have to do whatever I can to help these people whom fight to protect Azeroth every day.
I just love Isle of Quel'Danas for its location in the map(seperated from other areas), the quests you do there and also if u take a good look it appears to be similar to Star Wars's Millenium Falcon :P
Theres so many nice and beautful zones with nice music, great questlines and stuff, but my favourite zone is by far Howling Fjord, because it reminds me the Faroe Islands, the most beautiful and epic place on earth imo! :)
My favorite zone is Grizzly Hills, I really love the Canadian feel to it and it was nice to have a nice forest zone that felt bigger. I also loved the music there that really gave you a calming feeling, especially at Vordrassil.
Definitely Scholazar Basin. The first time I was teleported there by the archmage in Dalaran, well, it was a bit of a gasp. Sooooooo beautiful. And not only the zone itself, but the music aswell! I can still dream away on that music...