Gateway to Art History is a terrific resource to art history sites; the links are divided into different eras and the site provides a plethora of links for each time division and each country
indexes the works of over 7500 artists; you can search by
name, by era, by style, etc to then be greeted with a list of links to
museums and galleries throughout the world that exhibit art by that
Artmuseum.net is a virtual online art museum that has special exhibits with info on each artist, a 3D tour of the works and many paintings. This is a terrific multimedia site with guided tours of modern American art and Van Gogh.
Kennedy Center Arts and Technology page has as its mission to help artists, teachers, and students gain access to and/or share information, resources, and ideas that support the arts as a core subject area in the K-12 curriculum.
World Art Treasures has as its principal purpose the desire to promulgate the discovery and love of art. Thanks to the 100,000 slides belonging to the Jacques-Edouard Berger Foundation, all of them devoted to art, and including the main civilizations, such as Egypt, China, Japan, India, Europe, its purpose is to offer a different approach to art through the World Wide Web. Taking advantage of the specificity of a multidimensional and multilevel network, it is an attempt to shed a new light on art and a new way to contemplate it.