This medieval looking fortress is the Schuylkill County jail in Pottsville, Pa. Built in 1851, it is still in use today. It is most famous as the site of the execution by hanging of six "Molly Maguires" on 21 June 1877.
It's interesting to compare the language of the 1980 and 2006 plaques. I was also struck by the phrase "convicted of violent crimes against the coal industry" on the 2006 plaque; the notion of committing violence against an industry suggests that -- insidious as it is -- so-called corporate personhood is not such a new concept after all.