The Great Wall sprawls on and on… still the most impressive thing I have ever seen built by man. Four horses can go side by side while walking along the walls. I thought of all the European castles I have built where I would be standing on a wall and thinking, at the time, wow, this is really a big and impressive castle. But then one day you make it to the Great Wall and you think back… wow, I was really kinda out of the loop on this whole magnitude issue.