16 photos: Stepping inside … 10 of the world's famous prisons
10 famous prisons: 1. Alcatraz, United States – The Isla de los Alcatraces (Isle of the Pelicans), as Juan Manuel de Ayala, the Spanish explorer, named it in 1775, or Alcatraz Island as we know it today.
16 photos: Stepping inside … 10 of the world's famous prisons
1. Alcatraz, United States – Cell 181 is clearly marked as being once occupied by Al Capone, prisoner number 85.
16 photos: Stepping inside … 10 of the world's famous prisons
2. Old Melbourne Gaol, Australia – Grim view inside Old Melbourne Gaol.
16 photos: Stepping inside … 10 of the world's famous prisons
2. Old Melbourne Gaol, Australia – Death mask of Ned Kelly, displayed at Old Melbourne Gaol.
16 photos: Stepping inside … 10 of the world's famous prisons
3. Devil's Island, French Guiana – Breaking in, not breaking out. The jungle encroaches upon the abandoned cells on Ile St. Joseph, French Guiana.
16 photos: Stepping inside … 10 of the world's famous prisons
3. Devil's Island, French Guiana – Stepping inside. Visitors can venture inside the abandoned cells on Ile St. Joseph, French Guiana.
16 photos: Stepping inside … 10 of the world's famous prisons
4. Oxford Castle, England – Oxford Castle and the Saxon St. George's Tower.
16 photos: Stepping inside … 10 of the world's famous prisons
4. Oxford Castle, England – The Debtor's Tower and gate.
16 photos: Stepping inside … 10 of the world's famous prisons
5. Horsens State Prison, Denmark – How it was — the harsh reality of Horsens State Prison in Denmark.
16 photos: Stepping inside … 10 of the world's famous prisons
6. Eastern State Penitentiary, United States – Now open year round, a tour of the 1829 Eastern State Penitentiary in Philadelphia explores the Gothic-like architecture and its role as a leader in penal reform.
16 photos: Stepping inside … 10 of the world's famous prisons
6. Eastern State Penitentiary, United States – Using the audio tour, visitors explore the haunting and crumbling building and listen as former guards and inmates describe life at Eastern State Penitentiary.
16 photos: Stepping inside … 10 of the world's famous prisons
8. Port Arthur, Australia – The UNESCO World Heritage-listed Port Arthur Historic Site.
16 photos: Stepping inside … 10 of the world's famous prisons
9. Hostel Celica, Slovenia – A mural by a Russian artist adorns the walls of a cell at Hostel Celica.
16 photos: Stepping inside … 10 of the world's famous prisons
9. Hostel Celica, Slovenia – Refurbished prison cells provide modern accommodation at the Hostel Celica.
16 photos: Stepping inside … 10 of the world's famous prisons
10. Robben Island, South Africa – Hard labor at Robben Island for maximum security prisoners like Nelson Mandela meant breaking rocks like these from the face of the limestone quarry.
16 photos: Stepping inside … 10 of the world's famous prisons
10. Robben Island, South Africa – Photograph of former Robben Island prisoners. Ahmed Kathrada, senior ANC leader and close friend of Nelson Mandela during their time in prison, said on their release, "We want Robben Island to reflect the triumph of freedom and human dignity over oppression and humiliation."