I like Mulgore because it is a pretty peaceful and wide open area and you can enjoy the view without too many players clashing against the color scheme. Quite a lovely area and relaxing until your next battleground or dungeon.
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My favorite zone is the Ulduar because of its beautiful structure and concept. Such as the star figures and the runed walls with all those lights.
I liked Nagrand, extremely wide open and the colors are amazing. More nessingwary animal grinding, killing HUGE clefthoofs and ganking people farming the elemental plateu and on the floating islands.Also came out with my favorite mount, the Talbuk. I ignored all quests and ground those ogres like crazy just to get those Talbuks.Good times.
my favorite zone is mount Hyjal, because of all the lore inside it, from the night elf gods to the prison to illidan
My favorite zone is and will always be nagrand. It was the coolest zone in TBC because it was very different from the other zones which were touched by the destruction of draenor. It was nice and peaceful and one of my favorite quests (ring of blood) was there. I have many good memories of that place from when I first started playing. The floating islands made it awesome for ambushes and I spent an unhealthy amount of time killing and attacking halaa. I was terrible at PvP back then but I still found it to be a lot of fun. I still go there sometimes in game.
It may not be the biggest zone or the one with the most dramatic eye catching colors, but I really love Duskwood. I remember the first time ever I entered the zone and the mood and the (lack of) light in there completely caught me. Some of the quest chains in there have a great story line and the challenge was good fun for the lvl(who doesn´t remember Stitches!) And most of all, I remember when a friend showed me the Twilight Grove, an area I had managed to not discover yet. One of the big dragons was up and I wanted to have a proper look at it - it was so beautiful - but when trying to sneak up a little bit closer to have a better wiew it suddenly discovered us and killed us both within 2 seconds. Every character I have made since then have quested through Duskwood. As hunter I even named my first ever pet Duskpaw as a tribute to the zone :)
Stranglethorn Vale Gotta love being ganked in such a green and luscious enviroment!
Zul'Drak is my favorite. The music is awesome that plays while you're questing there. I love the questline from beginning to end with all the Troll killing. It's the only zone in the game in which the entire area is an ancient ruin, with tiers, temples, and ghosts!
Tirisfal glade pos-shattering.It's creepy and now have MURLOCS!hell yeah.
The best zone to have ever been created is Nagrand. It represent nature's beauty, magnificient plains with a lot of wilds animals. I have spent hours and days flying over nagrand, from one flying island to another. Nagrand on HD, that is the best. We made a wedding for fun, and nagrand was the plase we had chosen for it. Everyone should spend hours there and relax! Fresh breath, just outside Shattrath!
My favorite zone would be Hellfire Peninsula, after doing so much in vanilla wow and all the hype for the burning crusade expansion, just going to the dark portal and rushing into the other side to be instantly confronted by a war zone with infernals and demons attacking en masse, huge pit lords rushing the stairs and horde and alliance working alongside each other. Just so very epic and the atmosphere was just captured perfectly, even though we where not prepared!
I would have to say old stranglethorn vale because its a very troll jungle place and untouched by war. And those pesky alliance don't mess things up. FOR THE HORDE!
My favorite zone would have to Redridge Mountains. This zone is amazing. Not only are the quests a GREAT parody, but the zone itself is like a time warp back to before the Second War. Every time I enter it I complete almost every quest in the zone because, let me tell ya, John J. Keeshan would want you to! :D