これが足尾銅山跡ですね。
https://i.imgur.com/a2aQVt8.jpg
https://i.imgur.com/6u7RvwP.jpg
https://i.imgur.com/Mm4nYCa.jpg
https://i.imgur.com/AUNUKpz.jpg
https://i.imgur.com/kUdD6La.jpg