GREAT WALL OF CHINA: The 4,160-mile barricade running from east to west is the world's longest man-made structure.
GREAT WALL OF CHINA: The 4,160-mile barricade running from east to west is the world's longest man-made structure.
长城(中国)：4160英里长的防御工事，自东向西绵延，是世界上最长的人造工程。