2. The Great Wall of China
The Great Wall of China (some call it the Great Wall of China) is a large Wall built to connect defensive fortresses in order to protect the territory of China from Mongol attacks. The Great Wall of China built from 722 BC in the Spring Age to the Ming Dynasty in 1655 is the greatest building in the history of human civilization stretching over deserts, mountains and plains like a Giant Dragon. According to measurements made by the Survey and Mapping Agency and the Cultural Heritage Administration of the People's Republic of China in 2009, the overall length of the Great Wall of China is 8,850km. The Great Wall of China has been included as a World Heritage Site by UNESCO in 1987 and is the only manmade building visible from outside Space despite the debate about this statement.