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
flagIndia
60%
10%
30%
0%
20
flagGreece
46%
20%
33%
0%
15
flagAustralia
44%
33%
22%
0%
18
flagGermany
35%
28%
31%
4%
171
flagAustria
34%
26%
36%
2%
41
flagPoland
30%
31%
32%
4%
2563
flagthe United States
25%
43%
28%
3%
32
flagthe United Kingdom
24%
24%
44%
8%
25
flagSwitzerland
19%
50%
23%
7%
26