Pennsylvania's ghost towns are company towns that outlived their company. The anthracite fields of the northeast, with the largest known hard-coal deposits in the world, were worked from patch towns like Eckley, Concrete City and Centralia; deep mining collapsed after the 1959 Knox Mine disaster and ended in the mid-1960s, and the Centralia mine fire has burned since 1962. Bituminous coal and coke built dozens of patches in the west, strung along what is now the Ghost Town Trail in Indiana and Cambria counties. Edwin Drake's 1859 strike at Titusville started America's first oil rush, which made Pithole a city of 15,000 to 20,000 people in 1865 and a ghost town by 1877. Lumber towns like Laquin and Ricketts cut themselves out of work when the forests were gone, and a few places, among them Kinzua, Livermore and Aitch, disappeared under reservoirs.
Most of what survives is in the woods: stone foundations and a cemetery at Rausch Gap, a graffiti-covered ore washer at Scotia, 149 concrete munitions bunkers where Alvira stood. The exceptions are the preserved sites, Eckley Miners' Village and Pithole, both run by the Pennsylvania Historical and Museum Commission, and Frick's Lock, a canal village owned by its township and stabilized by the power company next door. Many sites are on State Game Lands, open to walkers under Game Commission rules, and many more are on private land.