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2. The Great Wall, China

This centuries-old behemoth is the world's largest military structure. Not only is it significant in its history, but also in architectural significance, according to UNESCO. The Great Wall of China is 13,170 miles long. Researchers say it would take about 18 months for the average human to walk its length, but most visitors prefer to take selfies with the ancient structure and the surrounding majestic landscape.

Section of Great Wall near Beijing - China Hung_Chung_Chih / Getty Images
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