ON THIS DAY in 1962, a fire began in an abandoned coal mine under the borough of Centralia, Penna.  Fifty years later, it is still burning, and the town has been condemned and mostly abandoned. The ten remaining residents, however, still maintain a functioning borough government, which supports itself by offering tours of the site in which “extreme tourists” are guided through the steaming sinkholes, jagged smoking ditches, and fiery pits by a dead Roman poet of their choice.