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
65%
8%
26%
0%
23
flagEstonia
60%
0%
40%
0%
10
flagGreece
50%
18%
31%
0%
16
flagItaly
46%
46%
0%
7%
13
flagAustralia
44%
33%
22%
0%
18
flagGermany
36%
28%
28%
5%
243
flagthe United States
34%
31%
31%
2%
44
flagAustria
33%
23%
37%
3%
59
flagPoland
31%
31%
32%
4%
2720
flagthe United Kingdom
27%
24%
42%
6%
33
flagRepublic of Ireland
20%
0%
60%
20%
10
flagSwitzerland
19%
39%
26%
14%
41