Iwakuni Castle — Hilltop Fortress Over the Valley

Iwakuni Castle (岩国城) perches atop Mt. Yokoyama (200m elevation) overlooking Kintaikyo Bridge and the Nishiki River valley, built in 1608 by Lord Kikkawa Hiroie as a symbol of power after the Battle of Sekigahara. The original castle stood for only seven years before the Tokugawa Shogunate ordered its dismantling in 1615 under the 'one castle per province' edict. The current reconstruction (1962) rebuilt the keep using steel-reinforced concrete in traditional style, functioning primarily as observation platform and history museum.

The castle's strategic hilltop position provides commanding 360-degree views: Kintaikyo Bridge directly below, the Seto Inland Sea to the south, and the Chugoku Mountains to the north. The interior museum displays samurai armor, swords, historical documents about the Kikkawa clan, and dioramas explaining the castle's brief original existence. The real value is the top-floor observation deck — watching Kintaikyo Bridge from 200 meters above reveals the bridge's architectural genius and the valley's strategic importance.