This is a virtual picture cache. To claim a find you must take a picture of the green building (or skytram building) just west of the cache location. Your GPS must be clearly visible.
Your GPSr must be visible in your hand for the photo to count as a valid find. Logs that do not conform to this requirement will be deleted.
You first need to get yourself to Badaling—there are organised tours for visitors; locals can drive or take a bus. When you enter The Wall area, you have two choices: left or right. If you go to the right, the climb is not so steep, but there are many more people to contend with. If you go to the left, the scenery is arguably better and there are fewer people, however, the climb is steeper (as reflected by the terrain rating), but there is a virtual geocache to find.
The monument used to be located near the third tower (or the second tower, depending on how you count them—let your GPSr guide you). You need to descend a very steep staircase to access it. There is no hand rail, but the staircase is narrow, and you can steady yourself on the walls; be careful. The staircase is located on the left, just before the tower as you approach from Badaling.
Small note on cache maintenance: I am from Australia, on the first of what will be regular visits to Beijing on business. I chose to place this cache as a means of attracting geocachers to The Great Wall (and also to provide some entertainment for geocachers in Beijing—there is precious little geocaching to be done here). I chose a virtual cache as it is impossible to place a cache on the wall itself that won't be discovered by muggles.