Castle Craig (6)
A first close-up look at the tower.  It shows the north-east gable, topped by a parapet walkway, ending at either end in open-rounds, the whole supported by elaborate cable-moulding and dog-tooth decorated corbelling.  The parapet wall has fallen and the opening is a doorway that gives access from the garret storey to the walkway.  Interestingly, this doorway is the only opening in the entire north-east wall of the tower.  

Also of note are the line of small openings at eaves level, running along the top of the long North-west wall.  The only time I can remember seeing something like this before was (curiously) at the similarly named Castle of Craig in Aberdeenshire, where a parapet walkway has been covered by the main roof to form a gallery - however that seems an unlikely explanation here.
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