Smarthistory is a fantastic substitute for that art history class you never took in college.
smARThistory.org is a free multi-media web-book designed as a dynamic enhancement (or even substitute) for the traditional and static art history textbook. Dr. Beth Harris and Dr. Steven Zucker began smARThistory in 2005 by creating a blog featuring free audio guides in the form of podcasts for use in The Museum of Modern Art and the Metropolitan Museum of Art. Soon after, we embedded the audio files in our online survey courses. The response from our students was so positive that we decided to create a multi-media survey of art history web-book. We created audios and videos about works of art found in standard art history survey texts, organized the files stylistically and chronologically, and added text and still images. We are interested in delivering the narratives of art history using the read-write web's interactivity and capacity for authoring and remixing.
This thing is packed to the brim with content and it manages this with a clean interface that's easily navigateable, not an easy task by any means.