Sado

Carved into the rugged spine of Sado Island, the Aikawa Gold and Silver Mine once funded the Tokugawa shogunate’s treasury and, later, Japan’s industrial modernization. Today, its labyrinthine tunnels — some hand-chiseled in the 1600s, others blasted with dynamite during the Meiji era — form a UNESCO World Heritage site that reads like a geology textbook written by human ambition. The ‘Sodayu’ course leads you through Edo-period galleries where life-sized robotic miners reenact the grueling rhythm of fire-setting and hammer-and-chisel extraction; the ‘Doyu’ course descends into the Meiji-era western-style shafts, complete with a functioning mine cart railway and a massive underground pumping chamber. Above ground, the flattened summit of Mount Doyu — the ‘Doyu no Warito’ — gapes like a volcanic crater, a stark scar where an entire peak was sliced away vein by vein. The on-site museum displays a 12.5-kilogram gold bar you can (attempt to) lift, and the island’s Noh theaters, built with mining wealth, still perform under the stars each summer.