Kongō Sanmai-in

Kongō Sanmai-in (金剛三昧院) is a minor temple complex on Mount Kōya in Japan, founded in 1211 by order of Hōjō Masako for posthumous soul of Minamoto no Yoritomo and renamed "Kongō Sanmai-in" in 1219 for that of Minamoto no Sanetomo.

Hibutsu
The temple houses a hibutsu ("secret Buddha") statue which is generally hidden and displayed for only one day every five hundred years. It will next be on display in the late 2400s.