Is Paris Metro underground?

Related questions

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2. What is m in Paris?
3. Who built Paris?
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5. Is Eiffel Tower included in Paris Pass?
6. Can I buy Paris Pass in Paris?
7. What is a RER station in Paris?
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Tags

1. #underground
2. #france
3. #rapid
4. #kilometres
5. #short
6. #transit
7. #french
8. #between
9. #tropolitain
10. #paris
11. #transfers
12. #metropolitan
13. #mostly
14. #stations
15. #system
16. #lines
17. #which