We visited Centralia in August ourselves and crossed this one off the bucket list. The grave marker is a mystery. I am guessing John got remarried? Or maybe he's still alive and kicking!
We walked in about a half mile or so, it was kind of an interesting little hike between the piles of rubble. Someone took a lot of time trucking that in. It's quite an interesting place.
Here are some more drone shots.
I haven’t been there in a couple decades so not sure what access is like these days but the abandoned Pa turnpike tunnel was a cool place to visit too. It was a pretty popular place and there were a lot of people hanging out the two times I went. It even looked like some jackass had a fairly sizable bonfire inside the tunnel at some point.
There are two standpipes in that graveyard that communicate with the mine fire and vent the gases, which lends to the fogginess, I think. It doesn't always smolder but it was that day. The graveyard is still active and accepting new clients, oddly enough.