Whizbang Dustyboots
Gnometown Hero
The Sunless Citadel has a lot of great stuff going for it -- including an all-time great "enemy" NPC you're not really meant to kill -- but the map design is basically a tube. There aren't any very meaningful choices in its layout, making it, weirdly, a precursor to World of Warcraft's later dungeon maps, which tend to be kind of underwhelming.