ArtMuseum.net
Internet -based art museum experience, includes specialized exhibitions with emphasis on background information not normally available to the public.
http://www.artmuseum.net/

WebMuseum : Famous Paintings
Comprehensive and well organized site that offers rich images and concise historical context for artists and art movements ranging from Gothic and Renaissance to Impressionism and Pop.
http://www.ibiblio.org/wm/paint/

World Art Treasures
Based on the Jacques-Edouard Berger collection of images of art objects and essays devoted to the main civilizations, such as Egypt, China, Japan, India, Europe.
http://www.bergerfoundation.ch/