Documentary: World’s Largest/Longest Structure,Great Wall of China
The Great Wall of China is a series of stone and earthen fortifications in China, built, rebuilt, and maintained between the 5th century BC and the 16th century to protect the northern borders of the Chinese Empire during the rule of successive dynasties. Several walls, referred to as the Great Wall of China, were built since the 5th century BC. The most famous is the wall built between 200 BC – 220 BC by the first Emperor of China, Qin Shi Huang; little of it remains; it was much farther north than the current wall, which was built during the Ming Dynasty.
A video with the title “Great Wall of Camping” documents a group of young Western tourists as they camp on the Great Wall of China, via Current TV: