Art Institute of Chicago
Art Institute of Chicago: Art Access: Send a Postcard
Students develop an understanding of impressionsim by studying works of Claude Monet and then designing and sending their own postcards.
The Wharton Group
Discover France: Art Periods: Cubism
A detailed history and explanation of the ideologies behind cubism. Lots of cubism links as well.
Tech4Learning
Pics4 Learning: Images for Education: Paintings
Dozens of useful photos of various paintings from around the world! A useful reference in an art or history class. Browse through the examples, then click to enlarge.