The Great Wall of China is not a continuous structure.
Why it is true
It is actually a network of walls, trenches, and natural barriers built over several centuries by different dynasties, with large gaps between them.
Source: British Museum
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.