One of the most well known man-made creations is the legendary Great Wall of China. Having a history that spans centuries, this fantastic wall runs 21,196km/13,171mi. The intention of the wall was to provide fortification from attacking invaders from the north. Today it not only retains a historical importance but an architectural one as well.
This UNESCO Hertiage Site, is one of the most popular tourist attractions in the world.
Photo credit: Wikimedia Commons, owned by Severin Stadler
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