Are you an urban explorer explorer?
I know of something close-ish to Stawell that is worth a look however I also know you could probably find it yourself and it will enhance your adventure experience as locations are not usually just handed out as if this was a tourist information centre. Regardless of if they were Stawell and surrounds are pretty dry in terms of urbex. Look about 30mins south east in a town beginning with A and you might find something.
Wander often. Wonder always.