Matsushiro Underground Imperial Headquarters
Matsushiro, Empire of Japan
The Matsushiro Underground Imperial Headquarters (, Matsushiro Daihon'ei; "Matsushiro Imperial Headquarters Site") was a large underground bunker complex built during the Second World War in the town of Matsushiro, which is now a suburb of Nagano, Japan. The facility was constructed so that the central organs of the government of the Empire of Japan could be transferred there in the event of an Allied invasion. In its construction, three mountains that were symbolic of the Matsushiro municipality were damaged. Parts of the caves are open to the public today, and are operated as a tourist attraction by Nagano.
Archaeological site data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).