Where was Japan's Longest Day filmed?

1967 film by Kihachi Okamoto

Japan's Longest Day (1967) was filmed in Tokyo Imperial Palace, Kobe University, Daikaku-ji Temple, Kashihara Jingū and 京都市立清水小学校, 5 places named in its Wikipedia article, in Japan. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.

See them on the map → Wikipedia Source data