Nagano has a big network of underground bunkers built during the Second World War.
It was meant to contain an imperial palace, and the central organs of government. It was built semi-independently by several agencies, so I guess there are several entrances. Floor space of the many rooms adds up to the surface of a soccer field.
QUESTION: What bunkers can be visited by the general public?
For each site:
- Where is the entrance? (latitude, longitude)
- Name of the site, or link to more information about it appreciated
Presumably a part of the network:
https://en.wikipedia.org/wiki/File:Matsushiro2006_1111.jpg Raul654 GFDL license