https://external-preview.redd.it/uGrPwUgTy_afTGFHGjSISh3SHCZAKiPrEQP8tJUXkAo.jpg?auto=webp&s=9afb96d402cfd53aaf3d43ab93ddd9dd08fe18af

TIL that there are currently more than a million people living underneath the streets of Beijing.

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