Great Wall of China photo copyrighted by: Galen R. Frysinger
The Great Wall went through constant extensions and repairs in later dynasties. In fact, it began as independent walls for different states when it was first built, and did not become the "Great" wall until the Qin Dynasty.Over the next 1700 years, the Great Wall of China was enhanced which gradually became a world renowned manmade wonder.
Find more Great Wall images in the 7 Wonders gallery of Photorena.
All pics are under copyright of the photographer