I'll be posting some links for adventure maps. I've decided to drop my ad.fly linking as it's more of a hassle than it is profitable (.25 cents per click zzzz). So here we go:
Wordworks Horror Maps: Maps.
Hascraft Horror Maps: http://hascraft.webs.com/
Minecraft Forum list of adventure maps: http://www.minecraftforum.net/viewtopic.php?f=3&t=91726
Goodluck! Wordworks are especially difficult.