Nagoya Castle Ruins (Hideyoshi's Korea Invasion Staging Base)

Nagoya Castle Ruins mark the site of the largest military staging base ever built in Japan, constructed in 1591-1592 by Toyotomi Hideyoshi as the forward headquarters for his two invasions of Korea, known as the Bunroku and Keicho campaigns (1592-1598). At its peak the castle town housed over 100,000 troops, retainers, and camp followers, briefly making it one of the largest population centers in Japan alongside Osaka and Kyoto, with more than 130 subsidiary camps built by allied daimyo along the surrounding coastline. The castle itself was a large-scale stone-walled fortress with a keep, though after Hideyoshi's death in 1598 and the withdrawal of Japanese forces from Korea, the Tokugawa shogunate ordered it deliberately dismantled to prevent it from being used against the new regime; parts of its stone walls were reused in the construction of nearby Karatsu Castle. What remains today is a ruin field of stone foundations, terraced baileys, and dry moats spread across a coastal hillside, with the outline of the honmaru (main bailey) and several sub-baileys still traceable on the ground. Excavations since the 1980s have clarified the layout of the keep base and gates, and the site is managed jointly with the Saga Prefectural Nagoya Castle Museum on the same grounds, which contextualizes the ruins through Japan-Korea historical exchange. Interpretation follows the ruins' original layout rather than a reconstructed building, letting visitors walk the stone terraces and moat lines of the honmaru and ninomaru in their excavated, unreconstructed state. The site was designated a National Historic Site in 1955, reflecting its significance as the physical staging ground for one of the most consequential military campaigns of Japan's Sengoku-to-Edo transition, and for the resulting cultural exchange, including the forced relocation of Korean potters who later founded Arita and Karatsu ware.