Cimabue

Hello, This may sound silly but I am a graduating Senior for my undergrad and within the past year, due to a travel course, I am positive I want to continue my studies in Art History. The problem is I have only taken one Art History class (granted it was onsite in Italy and France) and I'm not sure if I have the necessary background to apply directly for a MA in Art History. I am considering applying to Post-Bac programs to fill in the basics I may not have. Does that seem practical? Or do you all think I would be wasting money? As of now I am earning a BA in an unique Great Books program similar to Thomas Aquinas College. Any thoughts?