The “Ballycarbery Castle” seen in Leap Year is really a combo of the Rock of Dunamase and some CGI. The Rock, which is in Co. Laois, not Co. Tipperary) is a nice spot to visit, although the view from the top of the ruins isn’t really the view that was seen in the movie (a little more CGI magic). Generally speaking, the arch they walk under and the walls right beside them appear to be real, and the lofty towers seen in the distance and the one they “climb” to the top of are fake. Dunamase isn’t really that high and steep, but it is a brilliant picnicing spot on sunny summer weekends. As Irish ruins go, this one is a little different because it was blown up by Cromwell’s forces in order to prevent the Irish using it against them.