Where is the famous Cave of the Crystals?

in Switzerland
in USA
in Mexico
in South Africa
The cave near Naica, Mexico, was discovered in 2000 by miners. At that time, it was completely submerged. Today, the cave is accessible because the mining company's pumping operations keep it clear of water. Unfortunately, the crystals deteriorate in air, and soon may be lost.
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in Switzerland
in USA
in Mexico
in South Africa
answers
flagSweden
8%
8%
64%
20%
25
flagthe Philippines
10%
14%
60%
14%
28
flagCanada
10%
8%
55%
22%
67
flagAustralia
14%
8%
53%
22%
49
flagIndia
24%
10%
52%
10%
119
flagItaly
11%
7%
53%
26%
67
flagthe United States
17%
14%
49%
17%
748
flagNorway
17%
10%
48%
23%
39
flagRussia
10%
18%
46%
20%
49
flagPoland
14%
12%
41%
30%
12823
flagthe United Kingdom
16%
8%
40%
33%
418
flagGermany
21%
9%
40%
28%
199
flagFrance
14%
16%
40%
28%
42
flagRepublic of Ireland
9%
16%
38%
33%
42
flagAustria
25%
11%
37%
25%
27
flagthe Netherlands
16%
8%
34%
40%
49
flagDenmark
18%
18%
33%
25%
27
flagUkraine
20%
14%
29%
31%
67
flagUnknown
17%
12%
28%
40%
476
flagSpain
28%
17%
28%
21%
28