Josh explores ancient mountain shrines and underground tunnels across Japan in search of the mystical Honjo Masamune sword. Along the way, he learns the ways of the samurai and forges his own sword.For even more Expedition Unknown, head to discovery+. Go to discoveryplus.com/expeditionunknown to start your 7-day free trial today. Terms apply. Hosted on Acast. See acast.com/privacy for more information.