I. GREAT WALL OF CHINA. The biggest man made structure ever built, is the Great Wall Of China. The Great Wall Of China is a wall that was built during the Chin dynasty. The Emperor during the Qin dynasty, Qin Shihuangdi, gave the order to build the wall. Parts of the enormous structure date back to the 4th century BC., but the earliest major work on the wall came during the Ch'in Dynasty, which lasted from 221 to 206 BC. The Great Wall Of China stretches about 1,500 miles (2,400 kilometers) from Bo Hai, a gulf off the Yellow Sea in the east, to a point deep in Gansu province in the west. The wall was origanally 6,000 miles ,but because of erosion and thie