The existence of Great Wall alone arouses great curiosity, and paying a visit to it will only arouse more. Just to name a few: how long is it? Why does it take various shapes in different regions? Is it really visible even from space? has any measurement of its length been performed? Is the practice of building houses with its bricks removed by nearby inhabitants still going on?In The Great Wall Explained, you will get satisfying answers of all these questions, and many more.