There is not one single "Great Wall". There are many stretches and thousands of miles of them, built and rebuilt over thousands of years, all in various stage o

There is not one single "Great Wall". There are many stretches and thousands of miles of them, built and rebuilt over thousands of years, all in various stage of decay save for a few sites preserved for tourism. Peter Hessler wrote a very readable piece for the New Yorker: https://www.newyorker.com/magazine/2007/05/21/walking-the-wall https://www.newyorker.com/magazine/2007/05/21/walking-the-wa...