Discover Osaka Castle’s genius military design on this walking tour. Starting at Lawson S Otemae Rest House Store, explore outer moats and defense layers built to delay and divide attackers. See the triple moats, multi-layered gates, and masugata entrances that trapped invaders. Walk zigzagging routes enemies once faced under fire. View the castle’s largest stone, learn 16th-century transport methods, and spot hidden stone marks from master craftsmen. Understand wall angles and stonework that made them unclimbable. Explore the tower as command post and last defense, with arrow slits, gun ports, and gold used as psychological warfare. Finally, discover how this “invincible” fortress fell in 1614–1615, shaped by the fierce rivalry between Toyotomi Hideyoshi’s legacy and Tokugawa Ieyasu’s ambition.