1902 - In this year, first reform school for delinquent boys is opened in Borstal, Kent.
1934 - American government opened Alcatraz prison for the nation's worst offenders. Located in the bay of San Francisco, this famous prison became part of the American history.
1948 - UK Criminal Justice Act created a model of all modern prisons.
1983 - This year marked the first occurrence of "permanent lockdown" mode in US prisons (23h long periods of cell isolation, with communal yard time for all inmates, work, educational programs and meals in cafeteria).
1989 - Pelican Bay prison in California was built for the sole purpose of holding inmates in isolation, thus becoming first supermax facility in the USA.
1991 - The Criminal Justice Act introduced the concept of "Probation Service" for all prisoners that served the sentence that was longer than 12 months.
1993 - Modern UK Prison Service was formed.
2002 - Administration of the American president George W. Bush formed the famous Guantanamo Bay detention camp, which held many war suspects fromwar in Afghanistan, Iraq and 9/11 terrorist incident.
2005 - America held over 40 supermax facilities who all enforced constant 23-hour periods of isolation.