The Cliffs of Moher

[Rafal]

Secondly, I’ll also bring your attention to McDermott's castle in Lough Key which has the same very, very particular attributes depicted in the Voynich.

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McDermott's Castle is a castle and protected national monument located in County Roscommon, Ireland. The site of a fortification since at least the 13th century, the structure's tower house may date from the 16th century, with much of the current building (including its crenellations) dating to the 19th century.

I guess it makes appearance of that castle in VM not very probable.