How thick are the walls of the castle which contains the Blarney Stone?

Answer:
The walls of the castle are 18ft thick. So arrows can't break through the castle. I got this answer from http://www.pennyparker2.com/blarney.html.

But its very scary walking round the top as the building is very high and all the inside has collapsed.

First answer by Plucas. Last edit by Catty xx. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 2 [recommend question].