National Gallery of Art - Access 4,000 objects with related information including painting, sculpture, and graphic arts from the Renaissance to the present.
Guggenheim Museum- this website provides access to digital images of artwork, interpretations, and biographies of thousands of artists.
Metropolitan Museum
About 3,500 objects highlights each of the Museum's curatorial departments as well as the entire department of European Paintings. Can be searched by artist, period, style, or keyword.
WebMuseum
Use this if you are still having a hard time picking a piece of art. Pick an artist's name and see examples of their art.
Artcyclopedia - Great place to start your research. Browse artist by name, nationality, movement, medium, and more.
Biography People - Biography.com