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About the Picture Slideshow/Slide Show:
       

Review:
        The Great Wall is the world's longest human-made structure, stretching over approximately 6,400 km (4,000 miles)Shanhai Pass in the east to Lop Nur in the west, along an arc that roughly delineates the southern edge of Inner Mongolia. It is also the largest human-made structure ever built in terms of surface area and mass.One of the most striking sections of the Ming Great Wall is where it climbs extremely steep slopes. It runs 11 kilometers long, ranges from 5 to 8 meters (16–26 ft) in height, and 6 meters (19.7 ft) across the bottom, narrowing up to 5 meters (16.4 ft) across the top.The wall also has watch towers at regular intervals, which were used to store weapons, house troops, and send smoke signals. Barracks and administrative centers are located at larger intervals.Communication between the army units along the length of the Great Wall, including the ability to call reinforcements and warn garrisons of enemy movements, was of high importance.



Pictures in Slideshow
        photo 1: The Great Wall of China,         picture 2: The Great Wall of China,         photo 3: An area of the sections of the Great Wall at Jinshanling,         picture 4: The Wall was made a UNESCO World Heritage Site in 1987,     Image 5: great_wallR.jpg     Image 6: great-wall-74.jpg         photo 7: The Wall was made a UNESCO World Heritage Site in 1987,     Image 8: GreatWall.jpg