Iwami Ginzan Silver Mine - Credit: Wikimedia Commons
The was an underground silver mine in the city of Ōda, in Shimane Prefecture on the main island of Honshu, Japan.Lyman, Benjamin Smith. (1879). Geological Survey of Japan, p. 87. It was the largest silver mine in Japanese history. It was active for almost four hundred years, from its discovery in 1526 to its closing in 1923. Read more on Wikipedia
Source: en.wikipedia.org