Searing Gorge is my choice. I like dwarves and their huge mine which is under half of Searing Gorge. In vanilla I had great times here, exploring room after room and doing some quests as a mage while had no idea where to really go ;-)
Any outland zone. You can tell that they gave the people who design the looks of the zones put in alot of effort to make it feel like you were on another planet.
My favorite zone would have to be Vashj'ir. I like Nemo movie style and Naga´s architect.I like a lot of walking in water on sea-bed.
I really like loch modan before the shattering, because its a beautiful place with a giant lake. And i was always leveling there with my new characters. It also had a huge dam and it was really fun to jump off it, well i you landed good :P. Too bad that the dam is broken now and the lake is almost gone. After the shattering i don't like loch modan anymore.
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I really liked the feel Hellfire Peninsula gave me the 1st time i was there, coming from dull Azeroth to this amazing zone and i still like it to this day, just flying around for the way it makes me feel :)
I've always loved Duskwood. Yes, there is a lot of running from one end of the zone to the other, but the story there is just plain fun to play through.
My favourite zone is the home of the bog lords, the naga, fen striders and the Cenarion Expedition. Zangarmarsh! With it's absurdly humongous fungii! I just love the wet, green, organic feel of the whole place.And the most important part: The absolutely adorable Sporeggar live in Zangarmarsh. Those small, lumbering mushroom men make me chuckle every time, and they've given me my favourite pet so far, the Tiny Sporebat ^^
I loved Thousand Needles - not the post-Cataclysm flooded version, but the vanilla version. I grew up in a desert region of Colorado near the Utah border, and that's exactly what the landscape looked like out there. Even after I moved away from home, logging in and running through Thousand Needles always reminded me of it. I'm kind of sad the rocks and spires are gone now.
i like azshara after shattering very much, i started grand new char to just check all new quests and so, it was gr8 to see azshara in lvl 10-20 zone not like be4 50-55, cuz anyway u never gone to it that time as u never get it on way but now u rly easy level on even enjoy the goblin track-way xD and yes my new char is goblin, so i enjoyed it alot, as ally u cant see everything so changed as for horde, so im new to horde and like it.i only would like to see scholomance for hc dung, cuz i love that dung alot.
Winterspring! Reminds me of winter back home, and it's overflowing with Thorium Veins, so I can always mine a little cash on the side whenever I'm there.
I really liked Karazhan. The music, the enviroment, the lore & the bosses are just amazing!