If you hover over the "Play" button and hit the right button, you'll get a set of four options. Go to the top option and click on it. This will extend the play function so that it will "loop" through the play feature. In other words it will go on and on, rather than just one time through!
Look for the darkest line on the map. This traces the Sung Palace Wall 700 years ago.
It was done in 2011 but they don't have the Moule map!
This is map with the Beijing Survey and the Moule map draped over it - plus the elevation map.
Here is a 3D map, again of the Beijing Survey. Have your red-blue glasses ready!
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