Interesting site about a little town called Centralia, PA:
Centralia is a town located in the heart of the anthracite mining region of Pennsylvania. In May 1962, a fire in a trash dump accidentally ignited the coal mine under the town. It has been burning underground ever since. Attempts to put out the fire over the years have been unsuccessful, and the population of 1,100 residents has since dwindled to only twenty or so.
I had read about Centralia several years ago in a magazine article and was intrigued. I couldn’t believe that this fire was burning for so long and nobody could find a way to put it out. Being interested in abandoned places, I thought it would be a great place to visit — an opportunity to see a ghost town before it becomes one. So one year around Independence Day, while everyone else was off enjoying the usual holiday celebrations, I was hopping in my car and driving 300 miles to Centralia, to see fireworks of a different kind.