great wall of china
A History of Walls
Donald Trump wants to build a wall and thinks Mexico will pay for it, but how have walls fared throughout history, and what can this teach us?
What It Would Take for Donald Trump to Build the Great Wall of America
Building a wall between the US and Mexico isn't a military project—but it will have to be.
Close to a Third of China’s Great Wall Has Perished
While estimates of the total length of the world heritage cite remain unclear, local surveyors and conservationists say human and the environmental factors are helping to erode what remains.
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