This power point guides students through a series of artistic styles of western civilization through different eras- classical, medieval, and Renaissance. It teaches them to think critically about art and how it reflects the periods from which they were created. It also contains a bit of tasteful nudity- mostly side butt and half draped "boobies" so depending on the maturity of your students, you might want to swap out some of the pieces for others.
Alia Klein, "Artistic Styles of the Western Civilization" June 2003. PowerPoint presentation.