The Museum in Mournhold will only buy a select few unique artifacts; even though they have a book lying around with a list of unique artifacts, you can only successfully sell about half of them (which sucks). And here is a list I've compiled (yes yes, way too much time and all that) of every single Dwemer ruin on Vvardenfell. Now I think this is all of them, but I may be wrong. Many of them don't even show up on the in-game map. Mzuleft Arkngthand Aleft Bthungthumz Bthuand Nchuleft Nchuleftingth (Vemynal) (Tureynulal) (Odrosal) (Endusal) (Dagoth Ur) Galom Daeus Arkngthunch-Sturdumz Mzanchend Bethamez Mzahnch Bthanchend* The ones in brackets are on Red Mountain under Dagoth Ur's control. Galom Daeus is the base of operations for the Quarra vampire clan. *This one I haven't found myself, I heard of it somewhere else. I've visited all the other ones though. :)