Hello
1- the Imp Castle : there are stairs
http://kiya1.via.t-online.de/images/Div_Impup.jpg2- The treasure maps. It is not a main quest but it is cool do do it.
http://kiya1.via.t-online.de/images/Div_Treasuremap1.jpg3- The House of Madness. You will find it in Iona'Dungeon
http://kiya1.via.t-online.de/images/Div_Iona.jpg4- The Wishing Well. It is not a quest but you can get nice things with it.
http://members.shaw.ca/divineone/WishingWell.jpgI don't want to spoil the surprise but if you need more informations, just ask for it.
Barta