Other
Virtual Exploration Society: Roy Chapman Andrews
Read about a real life Indiana Jones. Roy Andrews was a paleontologist who discovered fossils from the Cretaceous period in the middle of the Gobi Desert.
Minneapolis Institute of Arts
The Minneapolis Institute of Arts: Yuan Dynasty Map
This site from The Minneapolis Institute of Arts provides a full color map that details the expanse of the Yuan Dynasty from 1280 - 1365 A.D.