When it opened in 1829, the State Penitentiary for the Eastern District of Pennsylvania ("Eastern State Penitentiary") was the world's first true "penitentiary" in the sense that it was designed to inspire true feelings of penitence in the hearts of inmates. Initially characterized by its system of strict isolation and grand architecture, more than 300 prisons on five continents were modeled after Eastern State Penitentiary. Over 142 years of operation, the system of isolation was gradually abandoned and the penitentiary became a traditional modern prison; in 1971, the facility was closed. The Eastern State Penitentiary oral history project, 1993-2012, consists of about 130 oral history interviews with former inmates, employees of the State Penitentiary for the Eastern District of Pennsylvania ("Eastern State Penitentiary"), family members of employees, and volunteers such as Chaplains.