Castle on a Rock Island is not in Ireland and not real. Bummer!
Though I wish I had the original poster’s PhotoShopping talents, and though I wish there really was a very cool castle like that balanced on a rock island, it’s not true. Not in Ireland, not really a castle on top. HOWEVER, this rock island is still very cool anyway! And it’s real, in Thailand. I researched to get to the truth of the matter (because of my curious nature), and here is the Wikipedia entry for the real rock island (now called James Bond Island!): http://en.wikipedia.org/wiki/Khao_Phing_Kan
