http://www.offroaders.com/album/centralia/centralia.htm

Centralia Pennsylvania no longer exists on some maps. The story began sometime in 1961 along the outskirts of town when trash was burned in an old open pit mine. The fire in the open pit caught an exposed vein of coal on fire. The coal then began to burn underground. That was in 1961. Over 40 years and 40 million dollars later the fire still burns through old coal mines and veins following the coal under the town and the surrounding hillsides. The fire, smoke, fumes and toxic gases that came up though the back yards, basements and streets of Centralia practically ripped the town apart. Attempts to put the fires out were unsuccessful.

I'm going to Allentown this weekend I might have to check this place out.