Grandtully Castle (5)
There are indicators here that the main block of the 16th century Z-plan castle either contains, or was, the 'original castle'.  Firstly the main block is unusually square and secondly, the walls are massively thick for the time.  Also, at first floor level there is a mural passage that by-passes the upper end of the Hall - a rather 'antique provision.'

The chapel and vestry are late additions.
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