Eastern State Penitentiary is a historic prison located in Philadelphia, Pennsylvania. Opened in 1829, it was one of the first prisons to implement the Pennsylvania system, which emphasized solitary confinement and rehabilitation over punishment. The facility was designed to encourage reflection and reform among inmates. The prison operated until 1971 and is now a popular tourist attraction. Visitors can explore its crumbling walls and learn about its history through guided tours. Eastern State Penitentiary is also known for its unique Gothic architecture and has been featured in various films and television shows.