The Smoldering Ruins of Centralia (2006)
damninteresting.com
damninteresting.com
Centralia on Google Maps: https://www.google.com/maps/@40.8006547,-76.3428604,287m/dat...
Still, pretty crazy.
Avoid the few remaining natives, as they're understandably territorial and suspicious since they're living there in defiance of a court order.