Art Cyclopedia
http://www.artcyclopedia.com

Ask Art
http://www.askart.com

The Louvre - Paris, France
http://www.louvre.fr/

Kyoto National Museum
http://www.kyohaku.go.jp

The Metropolitan Museum of Art
http://www.metmuseum.org/home.asp

National Gallery of Art - Washington, DC
http://www.nga.gov/collection/index.shtm

National Gallery - London
http://nationalgallery.org.uk

New York Museum of Modern Art
http://www.moma.org

The New York Public Library Digital Collection
http://digital.nypl.org

World Art Treasures
http://www.bergerfoundation.ch