Reigan-do Cave(霊厳洞) is where Musashi wrote "Gorin no Sho." It is located in Unganji temple. When he was 62 year's old, he started writing his own record for his style Niten Ichiryu. Gorin no sho has 5 volume, earth, water, fire, wind and universe. It has all his knowledge of fighting. He died one week after he finished writing Gorin no Sho.

Tourist Info.
Open: 8:00 to 18:00 (Apr. to Nov.) 8:00 to 17:00.
Admission: 200 yen for adult, 100 yen for kids.

Access
0. at Kumamoto Station.
1. use taxi to Iwato no sato koen.