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Photo: Shutterstock/Jimmy Rooney
Alabama: Sloss Furnaces
Open from 1882 to 1971, this National Historic Landmark in Birmingham was once the world’s largest manufacturer of pig iron, though this achievement came at a cost. Working conditions at the plant were miserable, particularly from 1900 to 1906 under the reign of graveyard shift foreman James "Slag" Wormwood. Wormwood pushed his workers to take dangerous risks to speed up production, and 47 workers died during his reign (while many others were injured). The foreman himself died on site, and his spirit is said to have lingered. Workers complained of an "unnatural presence" at the plant, as well as being pushed from behind or told to "get back to work" by a mysterious voice. All in all, more than 100 reports of suspected paranormal activity at Sloss Furnaces have been recorded by the Birmingham Police.