Nirayama Reverberatory Furnace "Nirayama Hansharo was...

IZU, IZUNOKUNI, SHIZUOKA, JAPAN - 2015/09/05: Nirayama Reverberatory Furnace "Nirayama Hansharo was once an iron smelting facility in Izu, Shizuoka. The furnace represents the beginnings of modern iron production in Japan. The furnace received world heritage status in summer 2015 among other sites of Japan's Meiji Industrial Revolution which include Miyanohara Coal Mine, Nagasaki Shipyards, Miike Coal Mines, and others. Nirayama Reverberatory Furnace represented the most advanced technology of the time, and iron produced there was cast into cannons. (Photo by John S Lander/LightRocket via Getty Images)