Edo Castle was the largest castle in Japan.Explore the Ruins of Tokyo Castle with a Local Guide. Learn About Samurai History and Japan’s 2,600-Year-Old Imperial System. [Highlights] ・The Secret Behind Edo Castle's Impenetrable Defense ・Japan's 2,600-Year-Old Imperial System ・Visiting Yasukuni Shrine and Its Political Significance ・Visiting the Japanese Garden Admired by the Emperor ・Seasonal Beauty: Cherry Blossoms in Spring