One for the bucket list: I have now seen both ends of the Great Wall (even though several sites in East and West claim to be the real end)... This one ist the westernmost signal tower, slightly crumbling over the centuries as it is built out of rammed earth. For reference: #3 is the other end of the Great Wall in Shanhaiguan. Afterwards, I had some desert highway driving to Dunhuang which appears like an oasis after rather drab Jiayuguan.