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
61%
5%
33%
0%
18
flagAustralia
47%
29%
23%
0%
17
flagGreece
46%
20%
33%
0%
15
flagAustria
37%
24%
37%
0%
29
flagGermany
33%
29%
30%
5%
134
flagPoland
29%
32%
32%
4%
2482
flagthe United States
26%
43%
26%
3%
30
flagthe United Kingdom
22%
27%
45%
4%
22
flagSwitzerland
19%
52%
23%
4%
21