Castle Craig (10)
This end isn't so pretty!  The reason the tower is still standing at all is that every floor was vaulted, which massively strengthens and supports the walls.  The ground floor is vaulted and the vault over it, which formed the Hall floor, is where the large piece of timber and considerable quantity of fallen stone can be seen lying.  The next vault was the ceiling of the Hall and the floor of the laird's private room on the 2nd floor.  The next vault formed the top floor, level with the parapet at the other end of the tower - and perhaps one at this end too, and the 4th vault supports the roof.
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