In 2013 we got together with Rob Hill at IBD Adventures to create a charity fundraising trek along the Great Wall of China. It was an exciting trek to some lesser known crumbling sections, as well as some of the best preserved parts of the wall, and some tours in Beijing.
Here is a link to the IBD Adventures blog and photos from the tour
http://ibdadventures.weneedideas.ca/category/great-wall-of-china-trek/page/12/