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
43%
31%
25%
0%
16
flagGreece
41%
25%
33%
0%
12
flagGermany
31%
30%
31%
6%
80
flagthe United States
30%
43%
26%
0%
23
flagAustria
30%
38%
30%
0%
13
flagPoland
27%
34%
33%
5%
2234
flagthe United Kingdom
22%
33%
38%
5%
18
flagSwitzerland
14%
71%
14%
0%
14