Fodor's Expert Review Oyamazumi Shrine

Omishima, three islands over from Imabari, is home to this expansive shrine. Founded in the 6th century, it honors the Shinto god of mountains, sea, and war. In the 8th century, victorious warriors started leaving their weaponry here after battle as thanks for divine favor. The museum on the shrine's grounds holds more than two-thirds of the nation's designated National Treasures in swords, spears, breastplates, and helmets.