Definitely Scholomance. Lots of bosses, quests, interesting art and atmosphere. Since the zone level got quite a bit nerfed from the Vanilla days, I feel like a demi-god going in there at 40ish and surviving.
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My favorite zone has got to be Vashj'ir. The whole zone was beautifully done and I love riding my seahorse! :)
I would have to say Ulduar...the quest line...the encounters..the looks..EPIC!
Nagrand, there's something about the floating islands that makes the place so magical.
My favorite zone is by far Nagrand! I have always enjoyed maintaining bonsai trees, and the trees in Nagrand remind me of some of my bonsai! I also did the Maghar grind for my Talbuk mount there, and love trying to solo the Ring of Blood on my alts (and mostly failing at that, but it's still fun!).
My favorite place must be Mulgore. I'ts not that much and many things there to see, but i think that makes you see how great the WoW world looks.Atleast i think its a nice and calm place where you actually can look around and see how nice it is without you getting swarmed with "monsters".Its places like that you just want to take youre fishingpole with you and relax at a lake and have some cookies and milk. :)
I love the uldum zone.. The harrison jones quests are so much fun.
My favorite zone in World of Warcraft? I would have to go with Sholazar Basin for a number of reasons. First, the zone added some much needed color to a continent that was otherwise covered in nothing but snow and ice. The music in Sholazar Basin is beautiful - probably the best music that Wrath of the Lich King had to offer. I also loved the idea that one of the quests took you to Sholazar's Vanilla counterpart, Un'Goro Crater. I loved it so much that I completely ignored Icecrown and the Storm Peaks and leveled straight to 80 in there. Such a great zone...
Oddly enough, my favorite zone is one that I rarely quest through. I absolutely love Grizzly Hills. The music is incredible, the zone itself is (relatively) serene and simply majestic as a whole. I found the quests to be a bit unmemorable, but I just love flying through the zone, or spending some time fishing there back in Wrath (fish feast fish without PvP? yes please!).
Netherstorm, If you ever wanted to create a world that looked like it was falling apart, this is it.
Mine's kind of a toss-up, actually... I loved Nagrand all throughout BC, and then when WoTLK hit there was Scholzar Basin, which was very similar (I guess it was the Nesingwary kill-everything-that-moves chains). Though I would have to say, Howling Fjord and its whole norse lore feel definitely wins for me. I don't want to quest there ever again, but I love flying through. lol
Nagrand, no question about it :) It's so peaceful there, and I absolutely loved questing there :) I do occasionally go back there just to run around in that environment :)
My favorite all time zone has to be Winterspring. I loved going there and hanging out, listening to the ambient music and watching the snow fall. The entire area just flowed, it was beautiful.