It is not known for certain how the fire that made Centralia essentially uninhabitable was ignited. One theory asserts that in May 1962, the Centralia Borough Council hired five members of the volunteer fire company to clean up the town landfill, located in an abandoned strip-mine pit next to the Odd Fellows Cemetery. The firefighters, as they had in the past, set the dump on fire and let it burn for a time. Unlike in previous years, however, the fire was not extinguished correctly. The fire remained burning underground and spread through a hole in the rock pit into the abandoned coal mines beneath Centralia. Attempts to extinguish the fire were unsuccessful, and it continued to burn throughout the 1960s and 1970s. Adverse health effects were reported by several people due to the byproducts of the fire, carbon monoxide, carbon dioxide and a lack of healthy oxygen levels.
In 1979, locals became aware of the scale of the problem when a gas-station owner and then mayor, John Coddington, inserted a stick into one of his underground tanks to check the fuel level. When he withdrew it, it seemed hot, so he lowered a thermometer down on a string and was shocked to discover that the temperature of the gasoline in the tank was 172 °F. Statewide attention to the fire began to increase, culminating in 1981 when 12-year-old resident Todd Domboski fell into a sinkhole four feet wide by 150 feet (46 m) deep that suddenly opened beneath his feet in a backyard. Only the quick work of his cousin Eric Wolfgang in pulling Todd out of the hole saved Todd's life, as the plume of hot steam billowing from the hole was measured as containing a lethal level of carbon monoxide.
The only indications of the fire, which underlies some 400 acres spreading along four fronts, are low round metal steam vents in the south of the borough and several signs warning of underground fire, unstable ground, and carbon monoxide. Additional smoke and steam can be seen coming from an abandoned portion of Pennsylvania Route 61, the area just behind the hilltop cemetery, and other cracks in the ground scattered about the area. The underground fire is still burning and will continue to do so for a predicted 250-1000 more years.
From: http://en.wikipedia.org/wiki/Centralia,_Pennsylvania
