The story of Centralia, the town which has had a coal fire burning beneath it for fifty years is the stuff of legend. I won’t retell the story in this post but search for it in the search box and you’ll find numerous posts about it. In short, the town decided to burn its garbage in 1962 and it lit a coal vein on fire which still burns to this day. Thousands of residents moved away, the local highway was ruined and a bypass built, and now after decades of fighting, the remaining residents (all seven of them) have made a deal. They will get a settlement of 218K and get to remain on their land but upon their death the state takes it by right of eminent domain. There had long been pressure on them to sell but they resisted because of the value of the coal that could be mined once they sold. Now those issues are resolved.
When the fire will stop burning, no one knows.