What were Roman aqueducts built of?

Related questions

1. What did John of the Cross do?
2. How does the aqueduct work?
3. How were the aqueducts made?
4. What was the purpose of the Aqueduct of Segovia?
5. Who is Lady Julian?
6. What does Segovia mean in English?
7. How long did it take the Romans to build an aqueduct?
8. Who is Segovia?
9. What is Segovia famous for?
10. How old is the Segovia Aqueduct?

Tags

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16. #testament
17. #water
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20. #stand
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22. #roman
23. #still
24. #engineering
25. #various
26. #cement