China: The Great Wall, A Tourism Haven Stretching across approximately 21,196 kilometers across Northern China, it is the longest wall in the world. Like a gigantic dragon that winds up and down across mountains and plateaus, the Great Wall of China built about 2,300 years ago is described as one of the greatest wonders of the world. Every year, millions of tourists from around the world visit this attraction to experience the breathtaking process which is not for the faint hearted. GBC