Spot

This site is on the island of Honjima, which was the home base of the long standing Shiwaku Navy, a corps of master mariners. The quarry was operated by the Hosokawa clan during the time Osaka Castle was being built, and the family records state that in a period of a little less than nine months, from March to November 1623, a total of 149,228 work days were logged by four different work teams. This quarry provided 1,889 of the huge stones in the walls of Osaka Castle.