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Songdai Xiangshan underground Nagano City is very good, you can go to see it, open the view
MoreThis is one of the tunnels planned and constructed at the end of World War II. Some caves are now open to the public, and Nagano Prefecture operates them as tourist attractions.
Songdai Xiangshan underground Nagano City is very good, you can go to see it, open the view
Very worth visiting and learning place, very rewarding.