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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.
The Wharton Group
Discover France: Art Nouveau
This site contains information on Art Nouveau in great detail. Find out what this term means, and how this "new art" adapted from old styles.
Other
An Artists' Artist: Mary Cassatt
Kellie Hanna writes on Mary Cassatt, who is known as an Impressionist.
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.
Other
Gallery of American Impressionism
This resource is an online gallery where you can search through many American Impressionists works.
Art Cyclopedia
Artcyclopedia: Artists by Movement: Impressionism
Artcyclopedia provides a brief overview of the movement, and includes resources for finding Impressionist artists' paintings in famous art museums.
Khan Academy
Khan Academy: Monet, the Gare Saint Lazare
In "The Gare Saint-Lazare, the Auteuil Line" Monet shows his keen interest in light, color, and paint handling. This painting has been singled out as among the most impressive paintings of Impressionism. View this picture and read about...
Other
Artists and Guilds: Mary Cassatt
This site provides a very brief biography of Mary Cassatt accompanied by one of her paintings.