I'm not sure how tall the keep was originally, but the present height of 102 feet makes it Ireland's tallest castle. It definitely looks tall in person, though Blarney feels taller in person from sitting atop sheer rock. Whatever. It's tall enough. Feels like a wizard should be standing at the top of the tower hurling down fireballs just as you crane your neck back enough to see the top. It's that sort of tower.