World Treasures of the Library of Congress looks like a good source of images and information for world history classes and student projects.
Magna charta cum statutis angliae, (Great Charter with English Statutes). Library of Congress
These links are to exhibits that are closed, but whose images are still maintained on line. The Library promises to update exhibits, and on line collections will grow, too.
There really is some remarkable stuff, most of it obscure enough to be really cool, still.
A 16th century miniature pictures Rustam, the hero of the Persian national epic, The Shah Namah, tossed into the sea by the demon Akwan. (Library of Congress, Near East Section).
Millard Fillmore's Bathtub 