What material was the dome of Rome Pantheon made from?

concrete
marble
sandstone
wood
The temple - 43 meter in diameter - was built by emperor Hadrian. Its dome with 8-meter wide oculus was built of unreinforced concrete that has been a mystery for ages. The weight of Roman concrete used to build the monolitic structure is merely 1/5 of common concrete. Such effect was achieved by mixing in of volcanic tuff and pumice.
smyru
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Very interesting!
reach: rather globalarchitecturehistory of architecturehistory of ItalyRome

Answers by country

concrete
marble
sandstone
wood
answers
flagAustralia
42%
35%
21%
0%
14
flagthe United States
33%
38%
27%
0%
18
flagGermany
30%
34%
28%
6%
46
flagPoland
26%
35%
33%
5%
2102
flagthe United Kingdom
25%
37%
37%
0%
16