The first thing that comes to mind is Ravenloft, but that's what you just finished.
A couple of others also spring to mind, though. I bag on DragonLance a lot, but one thing you have to say is that the early DL modules had some excellent maps. I think it's Pax Tharka or something, in DL1, IIRC, that has another of those awesome Ravenloft-style maps with a cool elevator and all sorts of neat stuff like that. You could rewrite the module, just use that part of it, etc., but that map is a can't-go-wrong piece of cartography, IMHO.
You could also do worse than the stuff in I3 through I5 (the Desert of Desolation modules- I don't know how much the supermodule compliation changed stuff, but I suspect there may be different maps, since it got shoehorned into the FR :\). One of them has an awesome tricky pyramid full of misty passages and stuff. They'd probably need some tweaking, since one encounter includes like a bazillion mummies, spectres, wraiths, etc. coming in waves, IIRC, but the maps are fantastic.
I'm also a huge fan of the map in Dwellers in the Forbidden City, but that place is
huge. It takes a lot of DM work to make it run smoothly, but it's a great one IMHO. But not a traditional map-me-out-I'm-a-dungeon type thing.
There are pretty cool maps, and a fully developed town, surrounding wilderness and handful of dungeons in L1, the Secret of Bone Hill, too.
S3 is a good one if you like to splash sci fi in your fantasy. Huge areas that it's easy to get lost in. Lots of levels. Cool weirdo monsters. You get to pull out an aurumovorax and a froghemoth, among others!
For traditional, old-skool mapping challenges and issues, you could go with the map in the 1e DMG (and its associated description, especially the interestingly-concealed secret door). There's another version of it in the 3e DMG, too. It has some cool stuff going on in it, that's for sure!
Finally, I'd like to say that the maps in Red Hand of Doom are beautiful, probably the best combination of beauty and utility that D&D has produced so far in maps (at least that I've seen). I don't know that there's enough traditional "need to map me" areas, though.