The International Dunhuang Project is really first-rate in its utilizing technology in the service of understanding ancient texts and cultures along the Silk Route, but it is especially to be commended for putting together some great maps and integrating those maps into Google/Earth/Google Maps and now Bing maps. Follow this link to a Japanese site (a part of the IDP) to see some browser-challenging overlays. When the link opens, look for the red boxes at the top. Clicking on one brings up an overlay from an older map together with a slider. You can control the transparency of the overlay with the slider. Be prepared for a delay for the slider to activate the change in transparency. Curiously, the Bing map seems to work better than the Google Earth overlay which I will put up next.
(The overlay detail is REALLY impressive. It appears fuzzy in the default view, but if you zoom in using the "+" button the overlay map is extremely detailed at the 1-mile resolution. And the "3D Beta" Bing option is awesome and works like a charm. With it you can rotate and tilt while still controlling the opacity of the overlay!)
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