There's a ton of really good instances in WoW, but my favorite is probably Ulduar, between just the actual artistry of the zone itself, the amazingly crafted encounters, the non-binary hardmodes, and the layers upon layers of lore present inside.
For me, it is Karazhan. Damn I miss doing the progress raiding in there. It was such a complete and amazing raid if you ask me. And also the lore connected to that strange and mysterious place, is 100% sure a read. Favourite dungeon, would have to be classic WC! There was something special about burning hours in there, getting lost and killing bosses with your group.
Blackrock Depths is just so big and awesome
End Time. Absolutely love the dystopian feel to it & the lore behind it. My favorite instance by far !
Definetly Icecrown Citadel !
Favourite instance would have to be Karazhan, just because of the feel of the place.
Looking forward to exploring Tanaan Jungle, looks great
My favorite instance is Blackrock Depths
Blackwing descent, i love the atmosphere in that instance
My favorite instance is The Vortex Pinnacle
Grim Batol. Fond memories since I started playing in Cata.
It has too be Hour of Twilight, The battles with the Echos of the Dark Lady and the Priestess of Elune.... They were somewhat simple, but very inmersive for me!
Icecrown Citadel for sure <3.
My favourite instance is definitely Shadowfang Keep.
Imo the best instances were those in WotLK, but to pick a favourite... I'd go with Utgarde Pinnacle. It gave that sweet sweet feeling of scandinavia and vikings.
Stratholme is by far my favorite :):)
Blackrock Dephts because of the immense size, amount of lore, the time I have spent in the Grim Guzzler RPing or generally having a fun time with friends (thanks to Direbrew's Remote) and just the general feel I get when there, almost feels like a mini-expansion on its own ;D
Karazhan will always be my favorite instance! It's just so much fun.
Dragon soul for sure :F
Mount Hyjal is my favorite, the moving to the different bases and the epic last boss. It was cool to do the battle that was in warcraft.