Mulgore pre cata. First zone i ever experienced and by far the most innately beautiful one. It also had a pink hawk strider!
My favorite zone is the new western plague lands. Very small and tight knit with fun quests and a nice story line. The music is good and the mobs aren't super annoying either. I always go there when I'm leveling.
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Icecrown is definitely a sweet zone, epic quests and an epic dark feeling to the entire zone - the argent areas.
Storm peaks has got to be my favourite. A gloriously snowy mountain setting with massive amounts of Titan and Dwarf lore. The Brunhilder, Sons of Hodir, Frostborn, Iron dwarf and Earthen all fighting it out in addition to the Alliance and Horde makes for an amazing questing experience. Add to that it contains one of the best raids in-game in my opinion and Storm Peaks is a key zone for any leveler.
Grizzly Hills was pure condensed awesome in a can. Every single character over level 74 I have has leveled 74-76 in there. I absolutely adored the visuals of the place. In addition to some great quest lines, it also had a good possibility for some world PvP to spice the leveling up a bit every now and then.Leveling a worgen through the place did feel quite weird, though.
Out of every zone ive come across , id have to pick Hinterlands Pre-shattering. The landscape was so appealing to the eyes , with the gryphons and trolls running about. Also the quests there were tons of fun to complete and redo on alts :)
Stormwind. Blizzard did a great job with the way the city looks.
I would have to go with Moonglade mainly because in my option its the nicest looking zone.
Definitely Hellfire peninsula. I loved the looks of the place, especially the sky, and the quests were amazing.
No doubt that Deepholm is my favorite zone. Every time I zone in there I am overwhelmed with the awesome structure and design of the place, the sweet colors, and the atmosphere. I also enjoyed the questlines through there the most as well (uncovering a conspiracy, fighting on a ship, replacing a piece of the world pillar - good times!)
My favourite zone is probably Dragonblight. I loved the evidence of dragons in the area, and the snow. Being a scandinavian myself, I've always been a fan of northern/viking type of areas. And I thought Northrend only really felt like the harsh, cold place it was supposted to be when I was in Dragonblight, since several of the other zones lacked snow.
I'd have to go with Teldrassil. Always a nice calm and relaxing area to level, and I never get tired of leveling a Night Elf in this starting area (even now). Love the music and the overall look of the zone.
My favorite Zone in the entire World of Warcraft is Elywnn Forest. I’ve played for 5 years now, and looking back upon that beautiful zone, I get the reminiscent feeling of a childhood memory. I remember traveling from Northshire to Goldshire and wondering how they could make everything so far away, how I couldn’t find this ‘Stormwind’, and how there seemed to be no end to the rolling hills and thick trees… or the seemingly impossible dangers that lurked within them. It was so big to me when I first started, I thought it must contain the entire world and the idea of different places in Warcraft was so foreign I didn’t even consider it possible. Just like when you grow up things that were so awesomely large become small, Elywnn Forest is now only a brief foray I can soar through on the fastest of mounts. But even through the blur of trees, pleasant memories of chasing sheep, only to be shocked as they’re slain by a wolf (who promptly kills you for trying to get revenge) still stir within my heart.