The Story of Art by Ernst Gombrich
If you skipped Art Appreciation in high school and college like I did, this book's for you. It recaps art over the last several thousand years in its various forms (painting, sculpture, architecture). Read through it with a laptop, so you can see what he's talking about. I missed Parmigianino (Antea's painter) while reading it initially. Now I'm tempted to go re-read it to explore further.