Here is yet another very helpful, very cool tool for teaching art history. I actually found out about it in History of World Art II here at UMD. The Vatican Museums website (http://www.museivaticani.va/) has a feature that brings you on a high-quality virtual tour of the Sistine Chapel. The zoom-in tool is fantastic - you can closer to Michelangelo's famous painted ceiling than you could if you visited the chapel in real life. This virtual tour allows a class to view this magnificent piece of art history without taking a very expensive field trip.
Source: Vatican Museums. Web. 10 Nov 2011. http://www.vatican.va/various/cappelle/sistina_vr/index.html.