Jokes aside, there are more than 340 castles in Ireland. That’s an incredible amount. Because of its tumultuous history, castles were built by the Irish, the British, and the Scottish all during different eras of conflict. Some must-see castles include Cahir Castle in county Tipperary, Blarney Castle in county Cork, and Kilkenny Castle above the River Nore, which is one of the most visited historical sites in all of Ireland. If you have any heart in you for the childhood wonder associated with castles, this is reason enough to go. You could spend an entire trip just on the magnificent castles of Ireland.