After a false start (fog closed the highway), my friend took me to the Great Wall. We traveled in a bus the size of a minivan to two sites of the wall as well as the Ming tombs. Fortunately our early start, as well as the windy cold weather, reduced the number of tourists. A great world site, and almost solitary experience.
Mao said: "Climb the Great Wall, be a great man". He really was an extraordinary poet; as was my experience. It reminded me of Machu Picchu in Peru.