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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Well, for the catacombs at least it’s actually the other way around. As a TL;DR At the end of the 1700’s there were large sprawling networks of stone mines haphazardly placed under Paris that were threatening the structural integrity of the city, and at the same time the city was also facing a crises with graveyards literally overflowing. The Parisians of the time decided they could solve one issue with the other so they reinforced the mines and emptied the graveyards down below. Essentially they mined out the underground and filled it back in later with infrastructure.
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