Other
Brussels: Horta Museum
This site describes a museum which contains Art Nouveau style architecture. In depth information on Art Nouveau is also found on this page.
The Wharton Group
Discover France: Pierre Bonnard
This site is a biography of Pierre Bonnard, a French painter who helped the Art Nouveau style of painting.
The Wharton Group
Discover France: Art Periods: Cubism
A detailed history and explanation of the ideologies behind cubism. Lots of cubism links as well.