Original Deadmines, obviously!
Fav instance is definetly Gnomeregan, ah, all the wipes we had because of people that didnt know how to use the perachute :) Pally freefall ftw
My favorite instance is Ulduar It has nice music and awesome bosses!
Karazhan. Best raid ever. Loved the music, the encounters, the atmosphere, everything!
Stormstout Brewery all the NPCs making jokes as you pass makes me laugh everytime
Hard to choose between Zul'Farrak and the Sunken Temple. Loved both!
Well of Eternity for sure. I was hoping for it to became an instance since I had read the War of the Ancients trilogy.
Trial of the Champions
Well of Eternity for sure!
Dragon Soul :)
My fave would have to be Black Temple.
I still really love Wailing Caverns haha!
Original Wailing Caverns for sure. One of the first dungeons I ran and entering having to kill elites outside the instance was a great challenge. Also the rabbit hole nature of the dungeon was very fun to navigate.
Firelends - One Love!
My all-time favourite instance is definitely Karazhan.I just love the whole atmosphere :D
Favorite instance has gotta be Ulduar.
There were a lot of great instances from Wrath and Cataclysm, but I think my favorite was Firelands for a raid and Halls of Reflection and End Time for a dungeon. If I had to pick between those three I'd say Firelands though it needed a tad bit less trash!