The
Artcyclopedia allows you to search for artists, their works by title, or individual museums. The artwork covers a wide range. When you choose your keyword you are taken to a page with info on the appropriate data (artist, work, museum). At the site there is a description with links to sites where you can find the images or additional information. While it doesn't have every work or artist it does have a fine mix. I looked up Pablo Picasso, The Blue Boy, and Frank Frazetta. All of these come from different time periods and they were posted. I was especially impressed with the fact that the site listed Frank Frazetta, who is frequently thought of as an illustrator of fantasy novels.