Here is a mystery for you. The Great Wall of China is one of the architectural wonders of the world. Apparently not quite visible from space but very impressive nonetheless. Built and rebuilt many times over many centuries and by hundreds of thousands of labourers. The picture below shows you one of the most visited bits of the wall. The mystery is that the wall is so low at the top of the mountain: it is no more than half a meter high in some sections of the top of the hills, whilst it is a massive structure that is many meters high at the foot of the hills. The bit I walked on near Beijing had a huge fortress with massive walls at the bottom, and laughably short walls on top, no more than 2 kilometers away from the bottom.
Now, without cheating by looking it up online, can you give a good strategic theory for why on earth the wall is so low at the top of the hill but yet so massive at the bottom? I will give you my best guess on Monday. To be clear: this is not what you would see amongst the fortresses of Europe, where walls at the top of the hills are pretty impressive too. In Europe the defenders were clearly worried about keeping people out, whilst this is apparently not the role of the Great Wall of China….
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