The catacombs in Paris have sidewalks and ruins of buildings and are now completely covered by the modern city. Also under Manchester… I don’t get how a city used to exist and then another one is simply built on top. Let me know, thanks!
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When an old city was left empty, because of a natural disaster or something, people forgot about it and didn’t go there anymore, because they didn’t have a system like google maps yet. Then, nature would take over. Plants would grow over it and fertilize the soil. Wind etc. would break down the walls and very slowly, a city becomes buried under layers of dirt, stones and plants. It is then invisible and people sometimes build on it without knowing it is there.
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