The ancient Great Wall, in the summer

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Photo credit: © demin pan / Alamy / Afripics
License: Royalty Free
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Keywords: ancient, asia, backpackers, beijing, blue, boundary, building, castle, china, day, defense, door, east, engineering, famous, great, hiking, hill, historical, intelligent, landmark, material, mountain, national, peak, sky, specialty, stone, structure, sunshine, times, tower, traces, travel, traveling, underwater, walking, wall