Sacred Haven of Debauchery

and yes, I like the environments in both Baldur's Gate and Neverwinter Nights, not because of the epic scale on which the main plot is built (although in Neverwinter Nights it's still decent; the enemies just arrive and that's it, with the exception of the ancient lizardfolk... but in Baldur's Gate, you are the son of a god, and you fight against great dark forces, although this is mostly in side quests, and the main plot is about a cool mage who is the main character). What I like about them is their environment, locations, cities, NPCs, quests, and so on.