The Great Wall Scenery. The Great Wall Was Built In The Spring And Autumn Period, Which Lasted For More Than 2000 Years, With A Total Length Of More Than 50 Thousand Km. It Is The World's Longest Construction Time, The Largest Amount Of An Ancient Defense Project. Thus In A Few Hundred Years Ago, Colosseum, Leaning Tower Of Pisa, And So On As One Of The Seven Wonders Of The Ancient World. Hebei, China.

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2000 ago amount ancient autumn built china colosseum construction defense great hebei hundred largest lasted leaning length longest one period pisa project seven spring thousand thus time total tower wall wonders world x27 years