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
46%
33%
20%
0%
15
flagGreece
41%
25%
33%
0%
12
flagthe United States
31%
36%
31%
0%
19
flagGermany
30%
33%
29%
4%
62
flagPoland
27%
34%
32%
5%
2178
flagthe United Kingdom
23%
35%
35%
5%
17
flagSwitzerland
20%
60%
20%
0%
10