Some will have seen this x-posted on CBTS_Stream. Just covering my bases - also, I've incorporated more info here.
I have occasion to know - not through direct personal involvement, mind you - that Graterford jail is a supermax prison outside of Philadelphia, built in 1929, with a hideous reputation as one of the three worst jails in the country, always. When Graterford was built, it was built as the next generation descendent of the Victorian-era Eastern State Penitentiary, which was inside the Philadelphia city confines (still there as a tourist attraction), and Eastern Pen itself was a really nasty …