Add to those, Michael, Quentin's (sealed off) room, the antechamber attached to it, the empty parallel time room and, like I said, sundry "closed" rooms where various characters found stored-away items as in the Quentin haunting plot as well as the Gerard one, the main cellar room, the locked room where "Paul" was "buried," and, oh, so possibly many others. We've probably crossed into well over twenty, just in normal, regular time. Don't forget the room David locked Vicki in where Bill's soaked spook appeared to her as well as the corridor outside filled with discarded furnishings. One may, if he/she wants, count the patio outside the drawing room with the sometimes working fountain. We might be approaching 25. That's pretty hefty stuff for sets considering it was all shot in a claustrophobic studio with limited space on a "limited" (meaning cheap) budget. I've always taken umbrage when people say DS "skimped" on spending money. Considering all those sets (whether in Collinwood, at the Old House, at the Blue Whale, Roger's office, restaurants, and so many, many, many other places) the series far out-classed all other soap operas at the same time. And when taken into account that it was done "live-on-tape" with scenes shot primarily in sequence, with all that limited space, that was an incredible thing to do. From one day to the next, stuff had to be shuffled around, set up, taken down, recycled and then the process started all over again the next day. One of the DS books talked about it and how difficult but brilliantly it had been done, even showing "deck plans" as to how it was accomplished. Granted, the quality did suffer in later years. And even in the "pristine" years, it wasn't perfect with tombstones wabbling when bumped and "bushes" with Charlie-Brown-Christmas-tree bases toppling over, cameras panning back too far to reveal that "grass" was a rumpled mat with the flooring clearly visible, but, still, it was far above and beyond anything offered on daytime TV at that time.
But, also still, where were those bathrooms? And not a single TV set in the whole house? The only one we saw was in Buffy's apartment in '70 parallel time. That's where she probably watched soaps like Space is a Many Splendored Love, and prime-time shows like The Partridge Bunch.
Gerard