These websites are recommended, but not guaranteed. Be sure to TRAC them!
Google Art Project - Explore museums from around world, discover and view hundreds of artworks at incredible zoom levels, and even create and share your own collection of masterpieces.
Smarthistory from Khan Academy. This is an open source website. Check the contributor information to find out if you think the person who wrote the essay you're looking at is an expert on the topic.
ArtBabble - information about artists, styles and media from the Indianapolis Museum of Art.
Art Institute of Chicago
Harvard Art Museums
Metropolitan Museum of Art
Museum of Fine Arts Boston
Museum of Modern Art
National Gallery of Art
Smithsonian American Art
MoOM - The collection of online museums
Sites good for images, but not for information:
Famous Artists Gallery
Sites aimed at buying and selling art:
ENGLISH LANGUAGE ARTS
ENTERTAINMENT & SPORTS
SCIENCE & TECHNOLOGY