Why do the Paris catacombs exist?

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Tags

1. #quarries
2. #beginning
3. #bodies
4. #tunnels
5. #stories
6. #moving
7. #innocents
8. #million
9. #paris
10. #bones
11. #between
12. #emptied
13. #underground
14. #catacombs
15. #cemeteries
16. #began
17. #former
18. #years
19. #numbering