Great Wall of China

Our list goes from one superlative to the next. In 4th place: the Great Wall of China, the longest wall in the world and a modern wonder of the world.
However, the Great Wall of China is not a single continuous wall. It consists of a wild mix of several walls that are not all connected to each other. Some of the walls even run side by side or cross each other. But even a single wall counts as the longest wall in the world.
The entire Great Wall of China is ten times as long as this single wall – over 13,000 miles in total! And it stretches over mountains, through deserts and forests. Some parts are weathered and overgrown, others can be visited. And over 10 million people do this every year.