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Underground cities by country
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Subcategories
This category has the following 6 subcategories, out of 6 total.
C
Underground cities in Canada
(2 C, 1 F)
Underground cities in China
(2 C, 3 F)
I
Underground cities in Iran
(2 C)
J
Underground cities in Japan
(7 C, 18 F)
T
Underground cities in Taipei
(6 C, 9 F)
U
Underground cities in the United States
(2 C, 2 F)