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National Gallery of Art
National Gallery of Art: American Impressionists
This site provides many examples of American Impressionistic work. Also, under the section titled "Overview", it gives information into the origins of American Impressionism (click the "continued" link after the paragraph).
Metropolitan Museum of Art
Metropolitan Museum of Art: Peach Blossoms?villiers Le Bel
From the Metropolitan Museum of Art the painting "Peach Blossoms?Villiers-le-Bel" by the American impressionist painter Childe Hassam is profiled with a large image of the piece, a description, and links to related topics and artworks.
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.