Sunken Temple because it really feels like a deep ancient mystical place in the world that you just weren't supposed to be in. like a submerged temple underneath a lake in a place called swamp of sorrows? that screams high fantasy and i love it. the whole maze part of it how it is just so easy to get lost in there and never return. the secret statues to open up a hidden door to fight a boss. the DRAGONS flying around and how you fight ghosts of dragons and ancient tribes trying to reincarnate evil gods. i fiend for that shit.
Omg, yes! Original ST was actually super creepy and fun. The new bastardized version makes it one of the worst. Can't wait to revisit this one!
Shadowfang Keep. Was my first dungeon, so it has an special place in my heart.
Second place would be for SM Cathedral.
The deadmines, Shadowfang keep, Zul'Farrak, Scholomance, SM and ST are all on the top for me :)
Ragefire Chasm & Zul'Farrak.
Hands down BRD. It had all the elements of a great dungeon: layout and mechanics (locked doors, events etc.), scale, lore, atmosphere and ofc loot.