Great Wall of China
There seems to be some disagreement about how big the “great wall” is or was. It was not made all at one time, but the total length seems to be over 6,000 km (4,000 miles +/-). I have no idea. This visible section here, that you can take a bus tour from Beijing to, is still extremely impressive. It goes as far as you can see and just look at how tall and wide the wall is.
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