This site has a wealth of information on art history written for high school and college students. There are links to other art sites, galleries and museums.
"ArtBabble was conceived, initiated, designed, built, sculpted, programmed, shot, edited, painted and launched by a cross-departmental collection of individuals at the Indianapolis Museum of Art (IMA). It is intended to showcase video art content in high quality format from a variety of sources and perspectives. ArtBabble was created so others will join in spreading the world of art through video."
"As a community destination, deviantART is a platform that allows emerging and established artists to exhibit, promote, and share their works within a peer community dedicated to the arts."
"Explore museums from around the world, discover and view hundreds of artworks at incredible zoom levels, and even create and share your own collection of masterpieces."