The Matsushiro Underground Imperial Headquarters 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 government of Imperial Japan could be transferred there. 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.
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