holmesburg prison 's 101-year history was filled with violent riots , bloody beatings and most shocking of all - the cruel chemical experimentation on its inmates .
since its construction in 1895 , its high walls housed some of the country 's most dangerous criminals whose uprisings ended in death and mass-injury .
and haunting images published in 2011 proved that government doctors used the jail in philadelphia , pennsylvania to test chemical substances on inmates and disabled american .