Castle Craig (12)
It's curious that the builders went to so much trouble to built the surviving part of the castle without a single wooden floor, and yet from the evidence of the joist holes, the NW wing evidently did have timber floors.  Perhaps the building was built in two different stages and the collapse occurred where the graft was made.

The stair-well was not in the re-entrant as Canmore state, which would have put it on the left side, as viewed from here, it was placed opposite the door entering from the courtyard, where the 'quality', having dismounted from their horses in the courtyard, could enter the building and go straight up to the Hall without confronting the servants!
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